Add a basic transpiler strategy

Transpiler-Strategy.md

@@ -2,4 +2,32 @@
 
 This document describes with an high-level view how a transpiler implementer could implement those proposals.
 
-TBD
+## Parser
+
+The transpiler should be able to assimilate the grammar described in the main proposal document to be available in the transpiler's AST:
+
+- _ConstExpression_
+- _ConstClassExpression_
+- _ConstClassDeclaration_
+- _ConstAssignment_
+- _ConstCall_
+- _ConstUpdatePart_
+- _ConstUpdateExpresion_
+
+## Helpers
+
+The helpers that are going to be called by the transforms should implement a full immutable data structure manipulation library and make sure that none of the deeply constant rules are violated.
+
+[constant.js](https://github.com/bloomberg/constant.js/) looks promising as such library.
+
+## Transforms
+
+The new added AST Node Types should be translatable to helper calls:
+
+- _ConstExpression_ should be able to be converted to a call to a constant object or array creation helper
+- _ConstClassExpression_ and _ConstClassDeclaration_ should be able to be converted to a _ClassExpression_ or _ClassDeclaration_ extending an helper `ConstClass`
+- _ConstUpdateExpresion_ should be translated to a series of function calls to a mutate helper.
+
+## Loose/Strict mode
+
+The strict mode should perform const checks as much as it can while the loose mode should not do any of them.