doctl-auth: add page (#7526)

pages/common/doctl-auth.md

@@ -0,0 +1,24 @@
+# doctl auth
+
+> Authenticate doctl with one or more API tokens.
+> More information: <https://docs.digitalocean.com/reference/doctl/reference/auth/>.
+
+- Open a prompt to enter an API token and label its context:
+
+`doctl auth init --context {{token_label}}`
+
+- List authentication contexts (API tokens):
+
+`doctl auth list`
+
+- Switch contexts (API tokens):
+
+`doctl auth switch --context {{token_label}}`
+
+- Remove a stored authentication context (API token):
+
+`doctl auth remove --context {{token_label}}`
+
+- Show available commands:
+
+`doctl auth --help`