Update documentation

Add image about data and access at top of Swagger UI page.

src/main/resources/application.properties

@@ -38,7 +38,8 @@ openapi.info.contact.email=Icsscontrolsystemsupport@ess.eu
 openapi.info.contact.name=Support
 openapi.info.contact.url=https://jira.esss.lu.se/projects/NT/issues
 openapi.info.description=\
-  Perform Naming tasks Create Read Update Delete + Approve Cancel Reject \n\n \
+  Handle Naming of ESS wide physical and logical devices according to ESS Naming Convention \n\n \
+  ![Naming data and access](/images/naming_backend_data_access.png "Naming data and access") \n\n \
   Here are some useful links \n \
   - [Naming](https://confluence.esss.lu.se/display/SW/Naming+Tool%2C+Cable+DB%2C+CCDB%2C+IOC+Factory%2C+RBAC) in ICS Software toolchain \n \
   - [Introduction to Naming REST API](/pdfs/naming_rest_api_brief_introduction.pdf) + [Cheat Sheet](/pdfs/naming_rest_api_cheat_sheet.pdf) \n \