Add very basic seabird-minecraft-backend docs

Author: belak

src/SUMMARY.md

@@ -12,7 +12,7 @@
 - [Chat Backends]()
   - [seabird-discord-backend](admin/seabird-discord-backend.md)
   - [seabird-irc-backend](admin/seabird-irc-backend.md)
-  - [seabird-minecraft-backend]()
+  - [seabird-minecraft-backend](admin/seabird-minecraft-backend.md)
 - [Plugins]()
   - [seabird-adventofcode-plugin]()
   - [seabird-datadog-plugin]()

src/admin/seabird-minecraft-backend.md

@@ -0,0 +1,23 @@
+# seabird-minecraft-backend
+
+[![Static Badge](https://img.shields.io/badge/repository-blue?logo=git&label=%20&labelColor=grey&color=blue)](https://github.com/seabird-chat/seabird-minecraft-backend)
+<!-- [![GitHub Actions Workflow Status](https://img.shields.io/github/actions/workflow/status/seabird-chat/seabird-core/docker-publish.yml)](https://github.com/seabird-chat/seabird-minecraft-backend/actions/workflows/docker-publish.yml) -->
+
+## Dependencies
+
+- `seabird-core`
+- a Fabric Minecraft server
+
+## Configuration
+
+### Config File
+
+The config file is a json file located at
+`config/seabird-minecraft-backend.json`, with the following properties:
+
+- `seabirdHost` (optional, defaults to `seabird-core.elwert.cloud`)
+- `seabirdPort` (optional, defaults to `443`)
+- `seabirdToken` (required)
+- `backendId` (optional, defaults to `minecraft`)
+- `backendChannel` (optional, defaults to `minecraft`)
+- `systemDisplayName` (optional, defaults to `Minecraft`)