init: Start dotfiles with a test container to verify installation.

README.md

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+# dotfiles
+
+This source repository contains configuration for common Unix systems.
+
+Influences include:
+
+- [Luke Smith's voidrice](https://github.com/lukesmithxyz/voidrice)
+- [Whynothugo's dotfiles](https://git.sr.ht/~whynothugo/dotfiles)
+
+## Install
+
+This uses `make`.
+
+## Test
+
+To create a container, install the dotfiles there, check the installation, and then destroy the container, run:
+
+```
+make check
+```