docs: add README file for instructions on how to get the doc started in local development

docs/CONTRIBUTING.MD

@@ -0,0 +1,24 @@
+# Contributing to the documentation
+
+## Getting familiar with Mintlify
+New to Mintlify. [Start Here](https://mintlify.com/docs/quickstart)
+
+
+## 👩‍💻 Development
+
+Install the [Mintlify CLI](https://www.npmjs.com/package/mintlify) to preview the documentation changes locally. To install, use the following command
+
+```
+npm i -g mintlify
+```
+
+Run the following command at the root of your documentation (where mint.json is)
+
+```
+mintlify dev
+```
+
+## Troubleshooting
+
+- Mintlify dev isn't running - Run `mintlify install` it'll re-install dependencies.
+- Page loads as a 404 - Make sure you are running in a folder with `mint.json`. Check the `/docs` folder