Update README.md

README.md

@@ -1,3 +1,22 @@
 # ldapdock
 
-configurable container running LDAP
+configurable container running LDAP
+
+most important steps
+
+build ldapdock
+```
+> docker build -t ldapdock /path/to/dockerfile
+```
+
+after build, check the docker image has been created properly with the given TAG
+```
+> docker images
+REPOSITORY    TAG       IMAGE ID       CREATED       SIZE
+ldapdock      latest    0e4a1521b346   6 hours ago   138MB
+```
+
+run into the container for the first time to check the LDAP server
+```
+> docker run -i -t ldapdock /bin/bash
+```