Create README.md

README.md

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+# zig-capnp
+Yet another capnproto code generator attempt for zig
+
+## Progress
+
+We are currently in early stages of development. This is not a useful project yet!
+
+- [x] Minimal reading
+- [ ] Reading of capnproto
+- [ ] Code generation (Reader)
+- [ ] Code generation (Builder)
+- [ ] Packed messages
+- [ ] RPC
+
+## Existing efforts
+
+### Zarzwick/capnproto-zig
+
+Gitlab: https://gitlab.com/Zarzwick/capnproto-zig/-/tree/main
+
+This appears the most advanced of existing efforts. The compiler is implemented in C++, not zig.
+
+I do not seem to be able to find the alternative efforts!
+