fix: add todo list to fence placement function

src/main/ts/fence-placement-validation.ts

@@ -19,7 +19,13 @@ import { isMovePossible } from "./movement-validation";
  */
 export function isFencePlacementPossible(gameBoard: GameBoard, start: Position, end: Position): boolean {
 
-    // #TODO: Implement this function
+    /*
+    #TODO: Implement this function
+    
+    This function should check that:
+        - the positions start and stop are valid
+        - there is no intersection with other fences
+    */
 
     return true;
 }