readme: add initial pkgcraft-related info

Author: radhermit

README.md

@@ -0,0 +1,11 @@
+[![ci](https://github.com/pkgcraft/bash/actions/workflows/test.yml/badge.svg?branch=main)](https://github.com/pkgcraft/bash/actions/workflows/test.yml)
+
+# bash
+
+Forked version of bash supporting shell interactions (e.g. writing builtins or
+modifying variables, arrays, and functions) natively in rust.
+
+## Development
+
+Note that currently the development workflow involves force pushing in order to
+keep the patch stack in order when upstream changes are merged.