Add README.

README.md

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+# Guix Configuration
+
+Custom declarations for [Guix](https://guix.gnu.org).
+
+## Usage
+
+Clone this repository.
+
+``` shell
+git clone https://git.sr.ht/~raghavgururajan/guix-config
+```
+
+### Home
+
+Copy the `guix home` configuration.
+
+``` shell
+cp guix-config/home/config.scm config.scm
+```
+
+Modify it to suit your circumstance.
+
+``` shell
+nano config.scm
+```
+
+Reconfigure your home.
+
+``` shell
+guix home reconfigure config.scm
+```
+
+### System
+
+Copy the `guix system` configuration.
+
+``` shell
+cp guix-config/system/config.scm /etc/config.scm
+```
+
+Modify it to suit your circumstance.
+
+``` shell
+nano /etc/config.scm
+```
+
+Reconfigure your system.
+
+``` shell
+guix system reconfigure /etc/config.scm
+```
+
+## License
+
+GPL-3.0-or-later. See `COPYING`.