Add plan of attack notes

TODO.md

@@ -1,3 +1,13 @@
+# Plan of attack
+
+1. modify visitor so it can handle scopes
+  -this is needed both to handle import scope correctly
+  -and also to support making FQSNs aware of function parameters
+
+2. Once FQSNs are aware of function parameters, most of the Rc<String> things in eval.rs can go away
+
+3. after that, get rid of symbol table from eval.rs
+
 # TODO items
 
 -use 'let' sigil in patterns for variables :