Add todo.md and instructions.txt just for history

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+# TODO
+
+- Add tests for relocations with all supported addressing modes.
+- Implement CLI option that can be used to specify regions of RAM and IO
+  registers. Custom ROM location and size is still not the case, only 4MiB at
+  the base `0x00000000` is supported and it remains.
+- Implement address substitution with some symbol instead of raw offset on all
+  instructions, that support `Word`, `Long`, `(d16,PC)` or relative displacement
+  addressing modes. Also substitute `immediate` values if they are look like an
+  address in the RAM, or other predefined location, but not ROM. Assume 24 bit
+  address space.