add page for Meowlnir

Author: tswfi

src/SUMMARY.md

@@ -19,6 +19,7 @@
     - [Telegram](./matrix/telegram.md)
     - [Whatsapp](./matrix/whatsapp.md)
     - [Hookshot](./matrix/hookshot.md)
+    - [Meowlnir](./matrix/meowlnir.md)
   - [Peertube](./services/peertube.md)
   - [Mastodon](./services/mastodon.md)
 - [Sysops](./sysops/README.md)

src/matrix/meowlnir.md

@@ -0,0 +1,5 @@
+# Meowlnir: An opinionated Matrix moderation bot
+
+Our moderation bot is a [Meowlnir](https://docs.mau.fi/meowlnir/index.html) instance named: HAL9000 (@abuse:hacklab.fi)
+
+TODO: write some usage documentation