meta: README file with basic TODO list

README.md

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+# PythonExtra - A community MicroPython for CASIO calculators
+
+*Original MicroPython README: [`README-MicroPython.md`](README-MicroPython.md).*
+
+This is a MicroPython port for fx-CG 50, fx-9860G III and related CASIO calculators.
+
+---
+
+**TODO list**
+
+Bugs to fix:
+- Don't refresh screen at every low-level console print
+- Fix not world switching during filesystem accesses (very unstable)
+
+Python features:
+- Compare features with existing implementations and other brands
+- Get filesystem access (open etc) with the POSIX interface
+- Get a decent amount of RAM not just the fixed 32 kiB that's hardcoded so far
+
+UI:
+- Use [JustUI](/Lephenixnoir/JustUI) to get a file browser (already available)
+- Add an option for fixed-width font which also sets $COLUMNS properly so that
+  MicroPython paginates (requires better getenv/setenv support in fxlib)
+- Use [unicode-fonts](/Lephenixnoir/unicode-fonts) to provide Unicode support
+  * Extend it with a fixed-width uf8x9 which maybe changes some glyphs (like
+    `i` and `l`; the usual fixed-width unambiguous styles)
+  * Try and provide a font smaller than 5x7 for more compact shell on mono
+
+
+Future wishes:
+- Build for fx-9860G II (requires manual filesystem support)
+- Lephe's secret ideas (complete previous list to unlock)