Mention this fork's changes in README

README.md

@@ -1,3 +1,16 @@
-# gopkg.in Stable APIs for the Go language
+# gopkg
 
-See [http://gopkg.in](http://gopkg.in).
+Stable APIs for the Go language.
+
+Forked from [gopkg](http://gopkg.in) to work with Code.as (and other sites powered by [Gitea](https://gitea.io) / [Gogs](https://gogs.io/)), instead of GitHub.
+
+## Quick Start
+
+```bash
+gopkg --domain go.code.as --src code.as --http ":8080"
+```
+
+### Configuration options
+
+* `--domain` - The public domain you want to serve versioned package from, e.g. go.example.com
+* `--src` - Your Gitea / Gogs instance where gopkg will search for code