adding necessary hosts note to readme

Author: S-Panta

docs/ocis/development/testing.md

@@ -585,11 +585,21 @@ The sample `fontsMap.json` file is located in `tests/config/drone/fontsMap.json`
 }
 ```
 
-
-## Running Test Suite With Document Servers  (Collabora, ONLYOFFICE or Microsoft using the WOPI protocol.) with dokcer
+## Running Test Suite With Document Servers (Collabora, ONLYOFFICE or Microsoft using the WOPI protocol.) with dokcer
 To run the test related to document Servers, go to `tests/acceptance/docker/documentServer` and run the command
 ```bash
    docker compose up
 ```
-Latest ocis build is done with local ocis docker image that is build with this docker compose file.
-oCIS will start in `https://ocis.owncloud.test/` along with all other service.
+Make sure you update the necessary hosts inside Ubuntu hosts file inside `etc/hosts`
+```bash
+   127.0.0.1	  ocis.owncloud.test
+   127.0.0.1	  traefik.owncloud.test
+   127.0.0.1	  minio.owncloud.test
+   127.0.0.1      keycloak.owncloud.test
+   127.0.0.1      collabora.owncloud.test
+   127.0.0.1      onlyoffice.owncloud.test
+   127.0.0.1      wopiserver-oo.owncloud.test
+
+```
+Latest oCIS build is done with local oCIS docker image that is build with this docker compose file.
+oCIS will start in `https://ocis.owncloud.test/` along with all other services.