add a todo list

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+# TODO
+
+## Standard Library
+
+### Math
+- [ ] division (float)
+- [ ] division (int)
+- [ ] mod (int)
+- [ ] exponent
+
+### Strings
+- [ ] concat
+- [ ] substring
+- [ ] lower/uppercase
+
+### Control
+- [ ] if
+
+## Lists
+- [ ] lex
+- [ ] parse
+- [ ] evaluate
+
+## Symbols
+- [ ] define
+- [ ] access