Create TODO_ParserGen.md

TODO_ParserGen.md

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+* Parsing
+    * No need to specify allow ambiguity or not
+    * Calculate ambiguous **Parse** cases, pointing out which AST need to support ambiguity
+    * Full CFG power, no limitation
+    * Be able to assign to any properties (not just enum) in with statement
+    * Error message generation
+    * Error recovering
+* Serializing
+    * Escaping and Unescaping pairs (instead of only unescaping)
+    * Calculate ambiguous **ToString** cases
+    * Generate **ToString** algorithm
+* AST
+    * Low overhead AST with reflection