Create readme.md with some instance info

readme.md

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+# Forsaken Ashbirds Git hosting
+
+This instance of [forgejo](https://forgejo.org/) is hosted by the Forsaken-Ashbirds community.
+Forgejo is a non-profit fork of the popular Gitea self-hosting software under the umbrella of [Codeberg e.V.](https://docs.codeberg.org/getting-started/what-is-codeberg/#what-is-codeberg-e.v.%3F)
+
+You may receive an invite to this instance if you're friends with us or ask politely on our [TeamSpeak server](ts3server://forsaken-ashbirds).
+
+### Action Runners
+
+At the moment, this instance provides 1 internally available action runner.
+The runner is hosted in the [Hetzner Cloud](https://cloud.hetzner.com) (CX22) and limited to IPv6 only (IPv4 is only available internally).
+It's hostname is ``fsn1-2.forsaken-ashbirds.net``.
+
+- __Your usage of this runner must be responsible.__  
+  Please don't overload it or run actions which would harm the reputation of this instance.
+- You are free to register your own runners inside your organizations, repositories or inside your account.  
+  [See docs/hosting-runners.md](docs/hosting-runners.md) for a little guidance.
+- If you want to volunteer additional runner capacity to the entire instance, feel free to get in touch.
+- Provided runners may not be available 24/7 but should be online most of the day.