Added new API endpoints for sightings management

app.py

@@ -0,0 +1,18 @@
+from flask import Flask, request
+from flask_restful import Resource, Api
+
+app = Flask(__name__)
+api = Api(app)
+
+class Sightings(Resource):
+    def get(self):
+        return {'message': 'GET request received'}
+
+    def post(self):
+        data = request.get_json()
+        return {'message': 'POST request received', 'data': data}, 201
+
+api.add_resource(Sightings, '/sightings')
+
+if __name__ == '__main__':
+    app.run(debug=True)