Add docs/ROADMAP.md from Claro v1.17.26 zip

docs/ROADMAP.md

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+# Claro Roadmap
+
+## RC3 - Classroom Readiness
+
+Status: current package.
+
+Focus:
+
+- lessons folder
+- stronger checker messages
+- Windows helper scripts
+- first-hour Quick Start docs
+- more beginner examples
+
+## RC4 - Final Polish
+
+Planned focus:
+
+- bug fixes only
+- all examples checked
+- final Quick Start review
+- Codeberg release notes
+- no known crash bugs
+
+## 1.0 - Stable Beginner Release
+
+Planned focus:
+
+- stable interpreter
+- friendly errors
+- tested examples
+- classroom-ready docs
+- clear Windows/Linux build instructions