Add ROADMAP.md for planned work (#27)

Author: bdbarnett

README.md

@@ -153,6 +153,8 @@ Struct-backed APIs, including displays, use methods consistently on all three ru
 - [building.md](docs/building.md) — build from source
 - Related: [lvgl-bindings](https://github.com/PyDevices/lvgl-bindings), [pydevices-examples](https://github.com/PyDevices/pydevices-examples)
 
+What's planned next is in [ROADMAP.md](ROADMAP.md).
+
 ## License
 
 MIT — see [LICENSE](LICENSE).

ROADMAP.md

@@ -0,0 +1,5 @@
+# Roadmap
+
+No larger changes are planned for lvgl-python right now. Work here follows bug
+reports and requests, so if something is broken or missing for you, open an
+[issue](https://github.com/PyDevices/lvgl-python/issues).