Introducing new step: "gctsCreateRepository" (#1424)

With the step gctsCreateRepository it is possible to create a local gCTS repository on an ABAP server

Co-authored-by: Marcus Holl <marcus.holl@sap.com>

documentation/docs/steps/gctsCreateRepository.md

@@ -0,0 +1,47 @@
+# ${docGenStepName}
+
+## ${docGenDescription}
+
+## Prerequisites
+
+With this step you can create a local git-enabled CTS (gCTS) repository on an ABAP server.
+Learn more about gCTS [here](https://help.sap.com/viewer/4a368c163b08418890a406d413933ba7/201909.001/en-US/f319b168e87e42149e25e13c08d002b9.html).
+
+## ${docGenParameters}
+
+## ${docGenConfiguration}
+
+## ${docJenkinsPluginDependencies}
+
+## Example
+
+Example configuration for the use in a Jenkinsfile.
+
+```groovy
+gctsCreateRepository(
+  script: this,
+  host: "abap.server.com:port",
+  client: "000",
+  credentialsId: 'ABAPUserPasswordCredentialsId',
+  repository: "myrepo",
+  remoteRepositoryURL: "https://github.com/user/myrepo",
+  role: "SOURCE",
+  vSID: "ABC"
+  )
+```
+
+Example configuration for the use in a yaml config file (such as `.pipeline/config.yaml`).
+
+```yaml
+steps:
+  <...>
+  gctsCreateRepository:
+    host: "abap.server.com:port"
+    client: "000"
+    username: "ABAPUsername"
+    password: "ABAPPassword"
+    repository: "myrepo"
+    remoteRepositoryURL: "https://github.com/user/myrepo",
+    role: "SOURCE",
+    vSID: "ABC"
+```