chore git ignore buildServer.json used by xcode-build-server (#1376)

xcode-build-server is used to integrate Xcode project with sourcekit-lsp

Author: khufu-dev

.gitignore

@@ -23,6 +23,7 @@ node_modules
 # IDEs and editors
 .vscode
 **/.idea
+buildServer.json
 
 # Build and test output
 coverage