added build file

README.md

@@ -74,6 +74,10 @@ When Git 2.18 or higher is not in your PATH, falls back to the REST API to downl
     # Default: true
     clean: ''
 
+    # Partially clone against a given filter.
+    # Default: null
+    filter: ''
+
     # Do a sparse checkout on given patterns. Each pattern should be separated with
     # new lines
     # Default: null