Add README.

README.md

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+# libipc
+
+libipc - Simple, easy-to-use IPC library.
+
+# Compilation
+
+Either `make` or `zig build`.
+
+For more options, see either the makefile or `build.zig`.
+
+# Usage
+
+See the [dedicated repository][examples].
+
+# Status
+
+LibIPC reached a stable state and is usable.
+Performance is fine for most projects, but can be largely improved.
+
+[examples]: https://git.baguette.netlib.re/Baguette/libipc-examples