cradle-install: add page (#2561)

pages/common/cradle-install.md

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+# cradle install
+
+> Installs the Cradle PHP framework components.
+
+- Install Cradle's components (User will be prompted for further details):
+
+`cradle install`
+
+- Forcefully overwrite files:
+
+`cradle install --force`
+
+- Skip running SQL migrations:
+
+`cradle install --skip-sql`
+
+- Skip running package updates:
+
+`cradle install --skip-versioning`
+
+- Use specific database details:
+
+`cradle install -h {{hostname}} -u {{username}} -p {{password}}`