docs: add roadmap

Author: SayanthRock

docs/ROADMAP.md

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+# Roadmap
+
+## Done
+
+- README rebuilt
+- Module metadata added
+- Install hooks added
+- Theme folder added
+- GitHub Actions ZIP build added
+- Customer support guide added
+
+## Next
+
+- Add original wallpapers
+- Add lock screen previews
+- Add home screen previews
+- Add icon previews
+- Add sound previews
+- Add tested device table
+- Add release notes
+- Publish first stable ZIP