Initial upload: git-insights-cli with CI/CD workflow

src/formatters/json_formatter.py

@@ -0,0 +1,15 @@
+import json
+from typing import Any
+
+from src.formatters.base import BaseFormatter
+
+
+class JSONFormatter(BaseFormatter):
+    """JSON output formatter."""
+
+    @staticmethod
+    def format(data: Any) -> str:
+        """Format data as JSON."""
+        if hasattr(data, "to_dict"):
+            data = data.to_dict()
+        return json.dumps(data, indent=2, default=str)