nixvim: functional simple config

nixvim/README.md

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+# Nixvim template
+
+This template gives you a good starting point for configuring nixvim standalone.
+
+## Configuring
+
+To start configuring, just add or modify the nix files in `./config`.
+If you add a new configuration file, remember to add it to the
+[`config/default.nix`](./config/default.nix) file
+
+## Testing your new configuration
+
+To test your configuration simply run the following command
+
+```
+nix run .
+```