Update README.MD

ansible/README.MD

@@ -109,4 +109,14 @@ ansible-playbook playbooks/initial_ostree.yaml -e blueprint=blueprint_example.to
 To build RPM for kiosk-config, microshift-manifests and Google Chrome, run the `build_RPMS.yaml` playbook
 ```
 ansible-playbook playbooks/build_RPMS.yaml
-```
+```
+
+## Repository Creation
+to build a repository containing the RPMS we created, run the 'repo_creation.yaml' playbook and indicate the desiered repo directory suring the -e argument.
+
+For instance to create repository in the '/opt/custom-rpms/' directory use :
+'''
+ansible-playbook playbooks/repo_creation.yaml
+'''
+
+