add basic howto to README.md

README.md

-Galaxy CWL IS Docker
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+Galaxy CWL IS Docker
+
+build: 
+
+```bash
+docker build . -t galaxycwlis
+```
+
+run server locally: 
+
+```bash
+docker run -i -t -p 8080:8080 -v /var/run/docker.sock:/var/run/docker.sock galaxycwlis:latest
+```
+
+open terminal in server: 
+
+```bash
+docker container ls
+
+docker exec -i -t [CONTAINER_NAME] /bin/bash
+```