add todos

todo.md

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+# TODOs
+
+- [x] Paren pair parsing
+    - iterative parsing and matching of paren/bracket pairs
+- [ ] tokenizer
+    - identify "tokens"
+    - everythin is a token with exception of:
+        - operators
+        - parens/brackets
+        - numbers
+        - t / nil
+        - comments (maybe already handled)
+- [ ] namespaces / scopes
+    - namespaces are started with:
+        - let / letseq / let...
+
+            ```skill
+                ; let[T]( locals: list[tuple[symbol, Any] | symbol] | nil, *exprs: Any, last_expr: T) -> T
+            ```
+
+        - prog
+
+            ```skill
+                ; prog( locals: list[symbol] | nil, *exprs: Any) -> Any
+            ```
+
+        - procedure
+
+            ```skill
+                ; function_name(req_param: Any, key_param1: any = value_param2) => Any
+                procedure( function_name(req_param @keys (key_param1 value_param2))
+                    ...
+                )
+
+                function_name(<req_arg> ?key_param1 <value_param2>)
+            ```
+
+- [ ] token contextualization
+    - looks for declaration / definition of symbol
+