[Coding style policy] Add proposals

Coding-style-policy.md

@@ -12,7 +12,16 @@ __echo false;
 }
 ```
 
-* Next proposal here
+* Proposal 2
+
+	Use one tab per indentation level (rendered as 4 spaces in GitHub)
+	```PHP
+	if(true){
+		__echo true;
+	} else {
+		__echo false;
+	}
+	```
 
 ## Trailing white spaces
 
@@ -20,15 +29,15 @@ __echo false;
 
     Lines must be trimmed of any trailing white spaces
 
-* Next proposal here
-
 ## Line length
 
 * Proposal 1
 
     Lines must be limited to 80 characters
 
-* Next proposal here
+* Proposal 2
+
+	Lines should have a length of less than 80 characters where possible. The maximum length for one line is 120 characters.
 
 ## Variables, functions, methods and class naming
 
@@ -42,4 +51,11 @@ class thisClass {
 }
 ```
 
-* Next proposal here
+* Proposal 2
+
+	```PHP
+	var $thisVariable; // camelCase
+	function this_function(){} // lower-case & underscore ('_')
+	class ThisClass { // UpperCamelCase (PascalCase)
+		function ThisMethod(){} // UpperCamelCase (PascalCase)
+	}