add a TODO file

TODO.md

@@ -0,0 +1,22 @@
+
+## Internal Details
+
+- arrays as iterators instead of a vector
+- a virtual machine and bytecode
+
+## Language Features
+
+- tuples
+- `extern "C"` functions
+- modules (`import` function)
+- structs
+- data types (need an IO object for stateful functions to return)
+- unpacking type parameters (`(x:xs)` in Haskell for example)
+- type variables in function parameters and data types
+- automatic Int to Float casting if a parameter expects a float
+- `[x..y]` array generators
+- `(+)` = `;.x y + x y`
+
+## Maybe Add
+
+- `/` for float division and `//` for integer division