Update compiling instructions in the readme.

Author: nlutsenko

README.md

@@ -33,8 +33,15 @@ And you're off! Take a look at the public [documentation][docs] and start buildi
 
  2. **Compiling for yourself**
 
-    If you want to manually compile the SDK, clone it locally, and run the following command in the root directory of the repository:
-
+    If you want to manually compile the SDK, clone it locally, and run the following commands in the root directory of the repository:
+
+        # To pull in extra dependencies (Bolts and OCMock)
+        git submodule update --init --recursive
+        
+        # To install all the gems
+        bundle install
+        
+        # Build & Package the Frameworks
         rake package:frameworks
 
     Compiled frameworks will be in 2 archives: `Parse-iOS.zip` and `Parse-OSX.zip` inside the `build/release` folder, and you can link them as you'd please.