Update contriguting doc

Add small info about install all packages in local development env

Author: smialy

CONTRIBUTING.md

@@ -35,6 +35,16 @@ This repository is organized as a monorepo, containing multiple packages that ar
 - **Autogenerated Packages**: These can be found in the `./versions` directory. This section contains components or packages that are automatically generated. The generation process is typically based on predefined specifications or templates and may be updated frequently to reflect changes in those specifications.
 
 This structure helps in maintaining a clear separation between manually edited and automatically generated code, facilitating better management and development workflows within the repository.
+## Manual Installation of Python Packages
+
+To manually install the necessary Python packages in editable mode, you can use the pip install -e command. This is useful for development purposes, as it allows you to make changes to the package source code and have those changes immediately reflected without the need to reinstall the package. Follow these steps to install the specified packages:
+```bash
+pip install -e ./packages/catalystwan-types \
+            -e ./packages/catalystwan-core \
+            -e ./versions/catalystwan-v20_15 \
+            -e ./versions/catalystwan-v20_16
+```
+By following these instructions, you will have the packages installed in an editable manner, allowing for easy development and testing.
 
 ## Running Tests