update doc

docs/source/contributing.md

@@ -0,0 +1,24 @@
+# Contributing
+
+## Frontend
+
+Unlike many Django developers who like to write client side code in template, I prefer to put them in a `*.js` files and Stimulus JS is my favorite to write **reusable** and **maintainable** JavaScript code.
+
+```bash
+$ npm install
+
+# launch webpack to compile the frontend assets and put them in `src/django_lookbook/static`
+$ npm run watch
+```
+
+## Backend
+
+```bash
+# install the package in editable mode
+$ pip install -e .
+```
+
+Notes:
+
+1. Then you can install it in your Django project and debug it.
+2. Or you can run the tests with `pytest`.

docs/source/index.rst

@@ -11,3 +11,4 @@ Topics
 
    install.md
    write_preview.md
+   contributing.md