add badge for testing of github action

Author: Tor Egil Jacobsen

README.md

@@ -12,3 +12,4 @@ test cucumber-backend action | ![](https://github.com/navikt/bidrag-test-github-
 test cucumber-clone action with github project | ![](https://github.com/navikt/bidrag-test-github-actions/workflows/test%20cucumber-clone%20action/badge.svg)
 test cucumber report workflow | ![](https://github.com/navikt/bidrag-test-github-actions/workflows/cucumber%20report/badge.svg)
 test git commit med og uten gitt author | ![](https://github.com/navikt/bidrag-test-github-actions/workflows/git%20commit%20workflow/badge.svg)
+test bidrag-maven/setup action (settings.xml) | ![](https://github.com/navikt/bidrag-test-github-actions/workflows/test-maven-setup-action/badge.svg)