Create docker-compose.yml

Now with docker-compose for ease use in prod

docker-compose.yml

+version: "3"
+services:
+  papermc:
+    image: gitlab.cl.uni-heidelberg.de:5050/tmueller/clspigot-docker:beta
+    environment:
+      MC_VERSION: "1.16.5"
+      MC_RAM: "6G"
+    ports:
+      - "25565:25565" # <Host-Port>:<Container-Port>, letzterer ist immer 25565
+    volumes:
+      - /coli/minecraft/papermc:/papermc
+      - /coli/minecraft/backups:/backup
+      - /coli/minecraft/web:/web
+    restart: on-failure
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