Updated Coding guidelines (markdown)

Coding-guidelines.md

@@ -1,3 +1,5 @@
+**NOTE: These are Coding Guidelines for TypeScript Contributors**
+
 While **these guidelines are mainly meant for contributors to the TypeScript project**, certain suggestions apply as to how idiomatic TypeScript code should be written (e.g. the "Names" and "Style" sections).
 
 ## Names