Copy code style rules from plank's HACKING file

HACKING

@@ -3,6 +3,7 @@
 ====== Testing the latest build ======
 
 Get daily builds on Launchpad for Ubuntu 12.04 and later.
+
     https://launchpad.net/~elementary-os/+archive/daily
 
 ====== Join IRC chat rooms ======
@@ -126,21 +127,35 @@ Be sure to understand this, and avoid a headache later!
 
 ====== Coding style ======
 
-Gala's source code in general follows the elementary Code Style.
-In fact, you can read more about it here:
+Gala's source code in general follows the K&R "One True Brace Style" (1TBS),
+with a caveat: spaces are inserted before opening parenthesis.
+
+For indenting the source code only tabs are used!
+Tabs should be 4 spaces wide for code to look good.
+
+Consider the following snippet as an example:
+
+    int test_check ()
+    {
+        if (x < 0) {
+            message ("Negative");
+            negative (x);
+        } else {
+            message ("Non-negative");
+            nonnegative (x);
+        }
+        
+        return 0;
+    }
+
+Of course the best example is the current source code itself.
+
+You can also have a look at this doc for some parts:
 
    http://elementaryos.org/docs/code/code-style
 
-NOTE: we don't use 4 spaces, but tabs instead. Also the position for curly
-      brackets for declarations differs from the docs, you place the first one
-      on a new line:
-
-class MyClass
-{
-	public void my_method ()
-	{
-	}
-}
+Keep in mind that neither the indentation rules or curly
+bracket positions mentioned there apply for Gala.
 
 ====== Committing code ======