cradle: add page (#2560)

pages/common/cradle.md

@@ -0,0 +1,20 @@
+# cradle
+
+> The Cradle PHP framework.
+> See `cradle-install`, `cradle-deploy` and other pages for additional information.
+
+- Connect to a server:
+
+`cradle connect {{server_name}}`
+
+- Display general help:
+
+`cradle help`
+
+- Display help for a specific command:
+
+`cradle {{command}} help`
+
+- Execute a Cradle command:
+
+`cradle {{command}}`