Implement basic API server

data/spot.py

@@ -1,3 +1,4 @@
+import json
 from dataclasses import dataclass
 from datetime import datetime
 
@@ -131,4 +132,8 @@ class Spot:
 
         # TODO use QRZ/HamQTH provider to get grids, lat Lon, when missing; and DX name
         #      credentials in config file which is .gitignored; sample provided
-        # TODO lat/lon from DXCC centre as last resort?
+        # TODO lat/lon from DXCC centre as last resort?
+
+    # JSON serialise
+    def to_json(self):
+        return json.dumps(self, default=lambda o: o.__dict__, sort_keys=True)