Create DOCUMENTATION.md

Author: palisadoes

DOCUMENTATION.md

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+# Documentation
+Welcome to our documentation guide. Here are some useful tips you need to know!
+## Where to find our documentation
+
+Our documentation can be found in ONLY TWO PLACES:
+
+1. ***Inline within the repository's code files***: We have automated processes to extract this information and place it in our Talawa documentation site [docs.talawa.io](https://docs.talawa.io/). 
+1. ***In our `talawa-docs` repository***: Our [Talawa-Docs](https://github.com/PalisadoesFoundation/talawa-docs) repository contains user edited markdown files that are automatically integrated into our Talawa documentation site [docs.talawa.io](https://docs.talawa.io/) using the [Docusaurus](https://docusaurus.io/) package.
+
+## How to use Docusaurus
+The process in easy:
+1. Install `talawa-docs` on your system
+1. Launch docusaurus on your system according to the `talawa-docs`documentation. 
+    - A local version of `docs.talawa.io` should automatically launched in your browser at http://localhost:3000/
+1. Add/modify the markdown documents to the `docs/` directory of the `talawa-docs` repository
+1. If adding a file, then you will also need to edit the `sidebars.js` which is used to generate the [docs.talawa.io](https://docs.talawa.io/) menus.
+1. Always monitor the local website in your brower to make sure the changes are acceptable. 
+    - You'll be able to see errors that you can use for troubleshooting in the CLI window you used to launch the local website.
+
+## Other information
+***PLEASE*** do not add markdown files in this repository. Add them to `talawa-docs`!