A Helm Repo that's in https://github.com/codecentric/helm-charts has a corresponding repo URL. Add it as follows:
1user@example:~$ helm repo add codecentric https://codecentric.github.io/helm-charts 2"codecentric" has been added to your repositories
Say you want install jenkins and corresponding repo already added.
1user@example:~$ helm install jenkins codecentric/jenkins 2NAME: jenkins 3LAST DEPLOYED: Sun Jun 28 09:59:52 2020 4NAMESPACE: default 5STATUS: deployed 6REVISION: 1 7TEST SUITE: None 8NOTES: …