rector: add page (#3112)

pages/common/rector.md

@@ -0,0 +1,24 @@
+# rector
+
+> An automated tool for updating and refactoring PHP 5.3+ code.
+> More information: <https://github.com/rectorphp/rector>.
+
+- Process a specific directory:
+
+`rector process {{path/to/directory}}`
+
+- Process a directory without applying changes (dry run):
+
+`rector process {{path/to/directory}} --dry-run`
+
+- Process a directory and apply coding standards:
+
+`rector process {{path/to/directory}} --with-style`
+
+- Display a list of available levels:
+
+`rector levels`
+
+- Process a directory with a specific level:
+
+`rector process {{path/to/directory}} --level {{level_name}}`