Added README

Signed-off-by: James Ketrenos <james_git@ketrenos.com>

README.md

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+When you start a new server, start it, then /save-all
+then edit server.properties as desired then re-start
+with docker-compose up -d
+
+# To upgrade
+```bash
+docker-compose up -d
+```
+
+# To profile
+
+```bash
+docker attach mc
+/debug start
+...wait...
+/debug stop
+CTRL-p CTRL-q
+```
+
+If "Something's taking too long" message are seen, there are
+too many farms. Kill them:
+
+```bash
+```
+
+# Find out where a player is
+
+```
+/data get entity PenguinLord Pos
+```
+
+# Destroy all 'cows' near coordinate
+```
+/kill @e[type=cow,x=<X>,y=<Y>,z=<Z>,distance=0..1000]
+```
+
+# See how many items there are
+```
+/data get entity @e[type=cow,x=<X>,y=<Y>,z=<Z>,distance=0..1000] type
+```
+
+
+# To 
+docker attach mc
+CTRL-p CTRL-q to exit