Updated README.md to add volumes usage

Author: joariasl

README.md

@@ -21,3 +21,17 @@ docker run -d --name openldap -p 389:389 \
 -e LDAP_PASSWORD='ADpassword' \
 openldap
 ```
+
+## Using volumes
+```
+docker run -d --name openldap -p 389:389 \
+-e LDAP_SERVERS='ldap://ad.example.com:389/' \
+-e LDAP_SEARCH_BASE='CN=DomainUsers,DC=example,DC=com' \
+-e LDAP_TIMEOUT=10 \
+-e LDAP_FILTER='(sAMAccountName=%U)' \
+-e LDAP_BIND_DN='CN=Administrator,CN=Users,DC=example,DC=com' \
+-e LDAP_PASSWORD='ADpassword' \
+-v openldap-conf:/usr/local/etc/openldap \
+-v openldap-data:/usr/local/var/openldap-data \
+openldap
+```