feat: initialize CCMA member administration

src/ccma/storage/atomic.py

@@ -0,0 +1,25 @@
+import json
+import os
+import tempfile
+from pathlib import Path
+from typing import Any
+
+
+def write_json_atomic(path: Path, data: Any) -> None:
+    path.parent.mkdir(parents=True, exist_ok=True)
+    descriptor, temporary_name = tempfile.mkstemp(prefix=f".{path.name}.", suffix=".tmp", dir=path.parent)
+    temporary = Path(temporary_name)
+    try:
+        with os.fdopen(descriptor, "w", encoding="utf-8", newline="\n") as handle:
+            json.dump(data, handle, ensure_ascii=False, indent=2)
+            handle.write("\n")
+            handle.flush()
+            os.fsync(handle.fileno())
+        os.replace(temporary, path)
+    finally:
+        temporary.unlink(missing_ok=True)
+
+
+def read_json(path: Path) -> Any:
+    with path.open("r", encoding="utf-8") as handle:
+        return json.load(handle)