gcloud: add page (#2126)

pages/common/gcloud.md

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+# gcloud
+
+> The official CLI tool for Google Cloud Platform.
+
+- List all properties in one's active configuration:
+
+`gcloud config list`
+
+- Set the active project:
+
+`gcloud config set project {{project_name}}`
+
+- SSH into a virtual machine instance:
+
+`gcloud compute ssh {{user}}@{{instance}} `
+
+- Display all Google Compute Engine instances in a project. Instances from all zones are listed by default:
+
+`gcloud compute instances list`
+
+- Update a kubeconfig file with the appropriate credentials to point kubectl to a specific cluster in Google Kubernetes Engine:
+
+`gcloud container clusters get-credentials {{cluster_name}}`
+
+- Update all gcloud CLI components:
+
+`gcloud components update`
+
+- Show help for a given command:
+
+`gcloud help {{command}}`