ohdear-cli: add page (#4690)

pages/common/ohdear-cli.md

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+# ohdear-cli
+
+> An unofficial Oh Dear CLI written with Laravel Zero.
+> More information: <https://github.com/nunomaduro/ohdear-cli>.
+
+- Display details about the currently authenticated user:
+
+`ohdear-cli me`
+
+- Add a new site to Oh Dear:
+
+`ohdear-cli sites:add {{url}}`
+
+- Display a list of sites and their current status:
+
+`ohdear-cli sites:list`
+
+- Display details about a specific site:
+
+`ohdear-cli sites:show {{site_id}}`