Add README.

README.md

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+# Guix Channel
+
+Custom definitions for [Guix](https://guix.gnu.org).
+
+## Usage
+
+### Try-out
+
+Clone this repository and load its modules using Guix's load-path.
+
+``` shell
+git clone https://git.sr.ht/~raghavgururajan/guix-channel
+
+guix command --load-path=path-to-repository package-name
+```
+
+### Subscription
+
+Add this channel to your list of guix channels located at `$HOME/.config/guix/channels.scm`.
+
+``` scheme
+(append
+ (list
+  (channel
+   (name 'rg)
+   (url "https://git.sr.ht/~raghavgururajan/guix-channel")
+   (introduction
+    (make-channel-introduction
+     "b56a4dabe12bfb1eed80467f48d389b32137cb60"
+     (openpgp-fingerprint
+      "CD2D 5EAA A98C CB37 DA91  D6B0 5F58 1664 7F8B E551")))))
+ %default-channels)
+```
+
+Run `guix pull` to sync the channel's modules with your store.
+
+## License
+
+GPL-3.0-or-later. See `COPYING`.