README: add a basic readme

README.md

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+# CPS-Config
+
+CPS-Config has been designed to be used a drop-in replacement for pkg-config,
+with at least some features from pkgconf, as well as it's own features.
+
+## Building
+
+You will need at least a C++ compiler, the Meson build system, and Ninja. It is
+currently only tested on Linux.
+
+Basic instructions are:
+```sh
+meson setup builddir
+ninja -C builddir test
+```
+
+## Status
+
+CPS-config is currently in alpha status. Some things work, others do not.
+
+Bug reports and other issues are welcome.
+
+Bug fix and feature PRs are welcome. For larger features please open an issue to
+help coordinate work.