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

docs/CLASSROOM_READINESS.md

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+# Classroom Readiness Checklist
+
+Claro RC3 is suitable for early classroom-style testing, but not final 1.0.
+
+## Ready to test
+
+- Beginner console programs
+- Interactive examples
+- Variables, math, choices, loops, lists, maps, functions
+- Simple files and JSON
+- Friendly `check` command
+- Windows and Linux/macOS build paths
+
+## Use with caution
+
+- Advanced scripts
+- Large programs
+- Graphics/game examples
+- Package/module workflows beyond simple imports
+
+## Recommended testing session
+
+1. Build Claro.
+2. Run `claro test`.
+3. Run `lessons/01_hello.claro`.
+4. Run `lessons/02_ask_name.claro`.
+5. Run `examples/quiz.claro`.
+6. Deliberately mistype `SAY` as `PRNT` and run `claro check`.