Adds readme files for every mv3 sample

api-samples/alarms/README.md

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+# chrome.browsingData
+
+This sample demonstrates using the `chrome.alarms` API to allow the user to set alarms using an extension page.
+
+## Overview
+
+The extension uses `chrome.alarms.create()` to set an initial alarm that is displated on the extension page. More alarms can be set with user input.
+
+## Running this extension
+
+1. Clone this repository.
+2. Load this directory in Chrome as an [unpacked extension](https://developer.chrome.com/docs/extensions/mv3/getstarted/development-basics/#load-unpacked).
+3. Pin the extension to the taskbar to access the action button.
+4. Open the extension popup by clicking the action button and interact with the UI.

api-samples/contextMenus/global_context_search/README.md

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+# chrome.contextMenus
+
+This sample demonstrates using the `chrome.contextMenus` API to let a user switch between searching different countries' versions of Google via a contextMenu.
+
+## Overview
+
+The extension uses `chrome.contextMenus.create()` to populate the context menu with locale options based on an options menu in the popup. A `chrome.contextMenus.onClicked.addListener()` event will open a specific locale's Google homepage when one of the extension's context menu options are clicked.
+
+## Running this extension
+
+1. Clone this repository.
+2. Load this directory in Chrome as an [unpacked extension](https://developer.chrome.com/docs/extensions/mv3/getstarted/development-basics/#load-unpacked).
+3. Pin the extension to the taskbar to access the action button.
+4. Open the extension popup by clicking the action button and interact with the UI.
+5. Right click within the browser to view and interact with the context menu.

api-samples/cookies/cookie-clearer/README.md

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+# chrome.cookies
+
+This sample demonstrates using the `chrome.cookies` API to let a user delete their cookies via a popup UI.
+
+## Overview
+
+The extension uses `chrome.cookies.getAll()` and `chrome.cookies.remove()` to delete the user's cookies when prompted.
+
+## Running this extension
+
+1. Clone this repository.
+2. Load this directory in Chrome as an [unpacked extension](https://developer.chrome.com/docs/extensions/mv3/getstarted/development-basics/#load-unpacked).
+3. Pin the extension to the taskbar to access the action button.
+4. Open the extension popup by clicking the action button and interact with the UI.

api-samples/default_command_override/README.md

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+# chrome.cookies
+
+This sample demonstrates using the `chrome.commands` API to create a new keyboard macro for switching tabs in the browser window.
+
+## Overview
+
+The extension sets Ctrl+Shift+Left and "Ctrl+Shift+Right as command inputs in the manifest, and uses `chrome.commands.onCommand.addListener()` to trigger switching tabs.
+
+## Running this extension
+
+1. Clone this repository.
+2. Load this directory in Chrome as an [unpacked extension](https://developer.chrome.com/docs/extensions/mv3/getstarted/development-basics/#load-unpacked).
+3. Input the keyboard commands to switch between tabs.

api-samples/favicon/README.md

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+# favicon
+
+This sample demonstrates using the favicon manifest permission to display the favicon of a url in the extension popup.
+
+## Overview
+
+The extension uses `chrome.runtime.getURL('/_favicon/')` to create a fully-qualified URL pointing to the "\_favicon/" folder. Then it returns a new string representing the URL with several query parameters. Finally, the extension appends the image to the body of the extension popup.
+
+## Running this extension
+
+1. Clone this repository.
+2. Load this directory in Chrome as an [unpacked extension](https://developer.chrome.com/docs/extensions/mv3/getstarted/development-basics/#load-unpacked).
+3. Pin the extension to the taskbar to access the action button.
+4. Open the extension popup by clicking the action button.

api-samples/fontSettings/fontSettings Basic/README.md

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+# chrome.fontSettings
+
+Demonstrates the `chrome.fontSettings` API by allowing users to modify the styling displayed fonts on webpages.
+
+## Overview
+
+Creates a user interface in the extension's options page that allows users to see and modify font settings using `chrome.fontSettings` to change parameters.
+
+## Running this extension
+
+1. Clone this repository.
+2. Load this directory in Chrome as an [unpacked extension](https://developer.chrome.com/docs/extensions/mv3/getstarted/development-basics/#load-unpacked).
+3. Pin th extension to the taskbar and click the action button.
+4. Click the extension's action button to visit the popup page.

api-samples/il8n/README.md

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+# chrome.i18n
+
+This sample demonstrates using the `chrome.i18n` API localize text in the extension popup.
+
+## Overview
+
+The extension includes localized translations of its UI text in the \_locales folder. It then uses `chrome.i18n.getMessage()` to populate the text in the extension UI with either French or English, depending on the current language setting.
+
+## Running this extension
+
+1. Clone this repository.
+2. Load this directory in Chrome as an [unpacked extension](https://developer.chrome.com/docs/extensions/mv3/getstarted/development-basics/#load-unpacked).
+3. Pin the extension to the taskbar to access the action button.
+4. Open the extension popup by clicking the action button.

api-samples/omnibox/new-tab-search/README.md

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+# chrome.omnibox
+
+This sample demonstrates using the `"omnibox"` manifest key and API to create a keyword that opens up a browser search in a new tab.
+
+## Overview
+
+The extension uses `"omnibox"` manifest key and its parameter `"keyword"`. When `chrome.omnibox.onInputEntered.addListener()` is triggered and the keyword 'nt' is used, a new tab is opened with a google search for the user's input text.
+
+## Running this extension
+
+1. Clone this repository.
+2. Load this directory in Chrome as an [unpacked extension](https://developer.chrome.com/docs/extensions/mv3/getstarted/development-basics/#load-unpacked).
+3. Type 'nt' and some text you wish to google within the browser omnibox.

api-samples/override/blank_ntp/README.md

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+# "chrome_url_overrides"
+
+This sample demonstrates using the ` "chrome_url_overrides"` manifest key to replace the user's default New Tab page with a new html file.
+
+## Overview
+
+The extension uses ` "chrome_url_overrides"` and its parameter `"newtab"` to replace the New Tab page with blank.html.
+
+## Running this extension
+
+1. Clone this repository.
+2. Load this directory in Chrome as an [unpacked extension](https://developer.chrome.com/docs/extensions/mv3/getstarted/development-basics/#load-unpacked).
+3. Open a new tab while the extension is enabled.