Update README instructions.

README.md

@@ -1,20 +1,40 @@
 # Parse Docs
 
-A static site that serves Parse's documentation using Jekyll on GitHub Pages. Work in progress.
+These are the markdown sources for all of the [Parse SDK guides](https://parseplatform.github.io/#sdks). The content for the guides is stored in this repo, and we use Jekyll to generate a static site that is hosted on GitHub Pages.
 
-## Setup
+## Repository Structure
 
-Install Jekyll and node packages:
+The guides are organized by platform. Each platform directory contains a set of markdown files, one for each main section in the guide.
+
+    .
+    ├── {platform}
+    │   └── {section}
+    └── common
+        └── {section}
+
+For example, `/ios/` contains all of sections for the iOS guide. There is also a `common` folder that contains content that is shared amongst all of the guides. It helps us avoid duplicating content unnecessarily.
+
+## Can I Access The Docs Offline?
+
+This repository is public and all the files are in markdown. If you'd like to keep a copy locally, please do!
+
+## How Do I Contribute?
+
+If you have any fixes or suggestions, simply send us a pull request!
+
+### Running The Site Locally
+
+Clone this repository, then install Jekyll and node packages:
 
 ```
 bundle install
 npm install
 ```
 
-## Development
-
-Run webpack and Jekyll:
+Then run webpack and Jekyll:
 
 ```
 npm start
 ```
+
+Finally, open http://localhost:4000/docs/ios/guide/ in your web browser.