add readme

README.md

+Spaceautomation
+===============
+
+Openhab configs for automating all the things
+
+
+Update OpenHAB and configure all things, items, rules, etc.:
+```
+ansible-playbook --diff main.yml
+```
+
+Only update things, item, rules, etc.:
+```
+ansible-playbook --diff configure_openhab.yml
+```