Update Dev Environment Setup Guide

Dev Environment Setup Guide.md

@@ -59,6 +59,7 @@ pip install -r requirements.txt
 - [ES Lint](https://marketplace.visualstudio.com/items?itemName=dbaeumer.vscode-eslint) for JavaScript linting
 - [Babel JavaScript](https://marketplace.visualstudio.com/items?itemName=mgmcdermott.vscode-language-babel) for JavaScript and JSX syntac highlighting and error checking
 - [Python](https://marketplace.visualstudio.com/items?itemName=ms-python.python) for working with Python virtual environments and debugging
+- [Python Docstring Generator](https://marketplace.visualstudio.com/items?itemName=njpwerner.autodocstring) for generating Google style docstrings according to section 3.8 of [Google's Python style guide](https://google.github.io/styleguide/pyguide.html#s3.8-comments-and-docstrings)
 
 Optionally:
 - [Remote - SSH](https://marketplace.visualstudio.com/items?itemName=ms-vscode-remote.remote-ssh) for directly editing files on remote machine