write TODO.md

TODO.md

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+# Lexer/Parser
+- Bit array like this `io.debug(<<3>> == <<3:size(8)>>)`
+- `@external`
+- `@deprecated`
+- Multiple subject `case` expressions
+- `panic`
+- Record updates like this: `Teacher(..teacher1, subject: "PE", room: 6)`
+- string patterns in `case` like this: `"Hello, " <> name -> name`
+- `todo as`
+- tuple integer access like this: `tuple.1`
+- qualified type reference like this: `bytes_builder.BytesBuilder = bytes_builder.new()`
+
+# Highlight / Annotate
+- Highlight qualified module references
+- Highlight types