initial structure implemented

docs -> _docs

models/recovery/search_session.py

@@ -0,0 +1,14 @@
+from pydantic import BaseModel
+from ..core.gps_point import GPSPoint
+
+
+class SearchSession(BaseModel):
+    session_id: str
+    flight_id: str
+    frame_id: int
+    center_gps: GPSPoint
+    current_grid_size: int = 1
+    max_grid_size: int = 25
+    found: bool = False
+    exhausted: bool = False
+