docs: updated readme to use includes folder as starting directory (#918)

Author: RahulLanjewar93

README.md

@@ -11,15 +11,16 @@ These are the markdown sources for all of the [Parse SDK guides](https://parse-c
 
 ## Repository Structure
 
-The guides are organized by platform. Each platform directory contains a set of markdown files, one for each main section in the guide.
+The guides are organized by platform inside the _includes directory. Each platform directory contains a set of markdown files, one for each main section in the guide.
 
     .
-    ├── {platform}
-    │   └── {section}
-    └── common
-        └── {section}
+    └── _includes
+        ├── {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.
+For example, `/_includes/ios/` contains all of sections for the iOS guide. There is also a `/_includes/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?