add Dockerfile, docker-compose, dependencies, and documentation

template/eula.txt

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+eula=true

template/server.properties

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+# Template server.properties file that allows remote control of the server
+# see https://minecraft.wiki/w/RCON
+broadcast-rcon-to-ops=true
+enable-rcon=true
+# don't change the next line! initializing a new Docker volume will automatically populate 
+rcon.password=<password_will_auto_populate>
+rcon.port=25575
+# the rest of the settings are automatically generated on server startup
+