add selfhosted links

selfhosted.md

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+# Android Links
+
+This is a collection of nice open source software for your server.
+
+  - [Communication](#communication)
+  - [DAV](#dav)
+  - [Newsfeeds](#newsfeeds)
+  - [Version Control](#version-control)
+
+### Communication
+
+  - [**SNM**](https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/)  
+    Complete and simple NixOS mailserver
+  - [**Synapse**](https://matrix.org/docs/projects/server/synapse/)  
+    Matrix.org’s reference server
+
+### DAV
+
+  - [**Radicale**](https://radicale.org/)  
+    Small but powerful CalDAV and CardDAV server
+
+### Newsfeeds
+
+  - [**Tiny Tiny RSS**](https://tt-rss.org/)  
+    Web-based news feed reader and aggregator
+
+### Version Control
+
+  - [**Gitea**](https://gitea.io/)  
+    Community managed lightweight code hosting solution written in Go