docs: Add blog post to folder mapping example readme.md (#477)

examples/Integration Mappings/README.md

@@ -2,6 +2,8 @@
 
 This script helps manage the folder mappings between Slack and Box if using Box as the content store for Slack. It creates a list of current Slack channel and Box folder mappings and can create or update mappings based on input csv. This script will maintain all permissons. 
 
+For details, checkout the [Medium blog](https://medium.com/box-developer-blog/new-box-cli-automation-template-to-manage-slack-integration-folder-mappings-a174f9985768).
+
 ## Setup Pre-Requisites
 1. Clone this github repo or download files from the `/examples` directory
    ```bash