chore: add NAMING.md

Closes angular#3787

Author: mhevery

NAMING.md

@@ -0,0 +1,31 @@
+Naming Conventions in Angular2
+---
+
+In general Angular2 should follow Java naming conventions.
+
+
+Classes:
+  - Example: `Compiler`, `ApplicationMetadata`
+  - Camel case with first letter upper-case
+  - In general prefer single words. (This is so that when appending `Proto` or `Factory` the class 
+    is still reasonable to work with.)
+  - Should not end with `Impl` or any other word which describes a specific implemenation of an 
+    interface.
+  
+  
+Interfaces:
+  - Follow the same rules as Classes 
+  - Should not have `I` or `Interface` in the name or any other way of identifing it as an interface.
+
+  
+Methods and functions:
+  - Example: `bootstrap`, `ngProbe`
+  - Should be camel case with first lower case
+
+
+Constants
+  - Example: `CORE_DIRECTIVES`
+  - Should be all uppercase with SNAKE_CASE
+
+
+