Stage 21

docs/README.md

@@ -0,0 +1,24 @@
+# CLeonOS Stage Docs
+
+## Available Stage Docs
+- `stage1.md`
+- `stage2.md`
+- `stage3.md`
+- `stage4.md`
+- `stage5.md`
+- `stage6.md`
+- `stage7.md`
+- `stage8.md`
+- `stage9.md`
+- `stage10.md`
+- `stage11.md`
+- `stage12.md`
+- `stage13.md`
+- `stage14.md`
+- `stage15.md`
+- `stage20.md`
+- `stage21.md`
+
+## Notes
+- Stage docs use a fixed template: goal, implementation, acceptance criteria, build targets, QEMU command, and debugging notes.
+- Stages 16~19 are currently not documented in this folder; add them later using the same template to keep history continuous.