clockwork-cli: add page (#2701)

pages/common/clockwork-cli.md

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+# clockwork-cli
+
+> A command line interface for the Clockwork PHP debugging framework.
+
+- Monitor Clockwork logs for the current project:
+
+`clockwork-cli`
+
+- Monitor Clockwork logs for a specific project:
+
+`clockwork-cli {{path/to/directory}}`
+
+- Monitor Clockwork logs for multiple projects:
+
+`clockwork-cli {{path/to/directory1 path/to/directory2 …}}`