Add more additional frontend information

README.md

@@ -2,7 +2,7 @@
 
 [GitLab](https://gitlab.tugraz.at/dbp/check-in/dbp-relay-checkin-bundle) |
 [Packagist](https://packagist.org/packages/dbp/relay-checkin-bundle) |
-[Check-in Application](https://gitlab.tugraz.at/dbp/check-in/checkin) |
+[Frontend Application](https://gitlab.tugraz.at/dbp/check-in/checkin) |
 [Check-in Website](https://dbp-demo.tugraz.at/site/software/check-in.html)
 
 This bundle handles check-ins to places and contact tracing for warning about COVID-19 cases.
@@ -12,6 +12,8 @@ the open source system for contact tracing at universities.
 
 See [Check-in Website](https://dbp-demo.tugraz.at/site/software/check-in.html) for more information.
 
+There is a corresponding frontend application that uses this API at [Check-in Frontend Application](https://gitlab.tugraz.at/dbp/check-in/checkin).
+
 ## Bundle installation
 
 You can install the bundle directly from [packagist.org](https://packagist.org/packages/dbp/relay-checkin-bundle).