Created Coding style policy (markdown)

Coding-style-policy.md

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+_**WORK IN PROGRESS: nothing described here should be considered as definitive**_
+## Indentation
+
+Use two space characters for each indentation level
+```PHP
+if ( true ){
+  echo true;
+else{
+  echo false;
+}
+```
+## Trailing white spaces
+
+Lines must be trimmed of any trailing white spaces
+
+## Line length
+
+Lines must be limited to 80 characters
+
+## Variables, functions, methods and class naming
+
+```PHP
+var $thisVariable;
+function thisFunction(){}
+class thisClass { 
+  function thisMethod(){}
+}
+```
+