Added a TODO file to keep track of pending work

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+# Unicode
+
+* Finish tests for to\*rune functions
+* Finish C string API functions
+* Finish rune handling functions
+* Finish UTF API functions
+
+# Data Structures
+
+## Binary Search Tree
+* Implement delete function
+* Implement iterator interface
+
+## Doubly Linked List
+* Implement iterator interface
+
+## Missing Data Structures
+* Implement a HAMT
+* Implement a Hashtable
+* Implement a splaytree
+* Implement a red-black tree
+