docs: add recipes

recipes/minecraft-admin.md

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+# Minecraft admin
+
+On the server (`./Taskfile ssh majcraft`),
+
+## run server commands
+
+```
+echo say hello > /run/minecraft/majcraft.stdin
+```
+
+## view server output
+
+```
+journalctl -xeau minecraft-server-majcraft
+```
+
+## shutdown server
+
+```
+echo stop > /run/minecraft/majcraft.stdin
+```
+or
+```
+sudo systemctl stop minecraft-server-majcraft
+```