add synapse standalone macos

Author: Lingling Peng

.pre-commit-config.yaml

@@ -6,6 +6,7 @@ repos:
     hooks:
       - id: trailing-whitespace
       - id: check-added-large-files
+        exclude: "synapse-standalone-macos"
       - id: check-ast
       - id: check-json
       - id: check-merge-conflict