go operator CRD example

docs/1._Getting_Started/Go/2-first-operator.md

 # First Operator
 
 As an introductory step we recommend going over the [tutorial](https://sdk.operatorframework.io/docs/building-operators/golang/tutorial/) on the Operator-SDK project in order to get familiar with the OperatorSDK CLI and what it does.
+
+For OKD4 operators we typically use:
+
+-  `--domain=webservices.cern.ch` 
+- a separate `--group=<myoperator>` for each operator
+- a GitLab project under <https://gitlab.cern.ch/paas-tools/operators>

docs/2._Development/Go/1-defining-a-crd.md

@@ -12,6 +12,20 @@ When you have reached a solid design, of your CRD the next step is to code its t
 - Defining the `Spec`: part of the CR that users will be able to modify;
 - Defining the `Status`: part of the CR that will be used by the Operator to report back status;
 
+## Example
+
+For OKD4 operators we typically use:
+
+-  `--domain=webservices.cern.ch` 
+- a separate `--group=<myoperator>` for each operator
+- a GitLab project under <https://gitlab.cern.ch/paas-tools/operators>
+
+```bash
+operator-sdk init --domain webservices.cern.ch --repo gitlab.cern.ch/paas-tools/operators/sitedetails-operator
+# create a cluster-scoped custom resource with Group=sitedetails.webservices.cern.ch, Version=v1alpha1, Kind=HostnameInfo
+operator-sdk create api --group sitedetails --version v1alpha1 --kind HostnameInfo --resource --controller --plural=hostnameinfos --namespaced=false
+```
+
 ## CRD Group, Version and Kind
 
 ### Group

docs/2._Development/Helm/1-create-helm-operator.md

@@ -4,7 +4,11 @@ In order to create a new Helm operator, refer to the upstream documentation:
 
 - <https://sdk.operatorframework.io/docs/building-operators/helm/tutorial/#create-a-new-project>
 
-E.g. for an application template `Nexus` for the app-catalogue, use the following domain and group so that each operator has its own group:  `operator-sdk init --plugins helm --domain webservices.cern.ch --group nexus --version v1alpha1 --kind Nexus`
+E.g. for an application template `Nexus` for the app-catalogue, use the following domain and group so that each operator has its own group:  
+
+```bash
+operator-sdk init --plugins helm --domain webservices.cern.ch --group nexus --version v1alpha1 --kind Nexus
+```
 
 You can create a Helm operator from scratch, or create one based on an existing chart.