make readme

Currently the has only been tested on Linux (wsl2).
The purpose to use version 0.11 because of initial support for zig pkg manager.

TODO: add libzmq module to build all deps, on single build (ref.: ziglang/zig#14307)

Author: kassane

bindings/zig/Readme.md

@@ -0,0 +1,16 @@
+# CZMQ - Zig bindings (**Experimental**)
+
+## Require
+
+- Zig version: [0.11 or higher - download](https://ziglang.org/download)
+
+### How to build library
+
+```bash
+$> zig build -Doptimize=ReleaseFast
+# output: $PWD/zig-out/lib
+```
+### Test
+```bash
+$> zig build test
+```