{doc} Refine authoring commands doc

doc/authoring_command_modules/README.md

@@ -28,39 +28,23 @@ For example:
 ```
 git clone https://github.com/Azure/azure-cli.git
 cd azure-cli
-virtualenv env
+python -m venv env
 source env/bin/activate
-python scripts/dev_setup.py
+azdev setup -c azure-cli -r azure-cli-extensions
 ```
+For more information, see https://github.com/Azure/azure-cli-dev-tools#setting-up-your-development-environment.
 
 After this, you should be able to run the CLI with `az`.
 
 [Author your command module...](#heading_author_command_mod)
 
-Now, install your command module into the environment with pip in editable mode.  
-Where `<path_to_your_command_module>` is the path to the directory containing your `setup.py` file.
-```
-pip install -e <path_to_your_command_module>
-```
-
-If installation was successful, you should be able to run `pip list` and see your command module.
-```
-$ pip list
-...
-azure-cli-example (0.0.1, /Users/myuser/Repos/azure-cli-example)
-...
-```
-
-Also, you can run `az` and if your command module contributes any commands, they should appear.
+If your command module contributes any commands, they should appear with `az`.
 If your commands aren't showing with `az`, use `az --debug` to help debug. There could have been an exception
 thrown whilst attempting to load your module.
 
 
 <a name="heading_author_command_mod"></a>Authoring command modules
 ------
-Currently, all command modules should start with `azure-cli-`.  
-When the CLI loads, it search for packages installed that start with that prefix.
-
 The `example_module_template` directory gives an example command module with other useful examples.
 
 Command modules should have the following structure:
@@ -79,6 +63,10 @@ Command modules should have the following structure:
 `-- HISTORY.rst
 ```
 
+You could create these files manually, or [create a module with `azdev cli create`](https://azurecliprod.blob.core.windows.net/videos/04%20-%20AzdevCliCreate.mp4).
+
+You could also consider using [Code-gen tool](https://azurecliprod.blob.core.windows.net/videos/04%20-%20AzdevCliCreate.mp4) to generate code automatically.
+
 **Create an \_\_init__.py for your module**
 
 In the \_\_init__ file, you will declare a command loader class that inherits from AzCommandsLoader. You will typically override the following three methods: