docs: added description for tiles model

Author: JanssenBrm

app/schemas/tiles.py

@@ -1,5 +1,5 @@
 from enum import Enum
-from pydantic import BaseModel
+from pydantic import BaseModel, Field
 from geojson_pydantic import Polygon
 
 
@@ -8,8 +8,14 @@ class GridTypeEnum(str, Enum):
 
 
 class TileRequest(BaseModel):
-    aoi: Polygon
-    grid: GridTypeEnum
+    aoi: Polygon = Field(
+        ...,
+        description="Polygon representing the area of interest for which the tiling grid should be calculated",
+    )
+    grid: GridTypeEnum = Field(
+        ...,
+        description="Identifier of the grid system that needs to be used to split up the area of interest",
+    )
 
 
 # class TileResponse(BaseModel):