Add new map and tileset files for Windows release

- Created test.tmj and test.tsj files in the maps directory.
- Added tileset.tsj with configuration for the MainTileset including image path and dimensions.

assets/entity_defs.json

@@ -0,0 +1,45 @@
+{
+  "entity_types": {
+    "ground_grass": {
+      "id": 1,
+      "tiled_id": 1,
+      "solid": true,
+      "sprites": {
+        "top": "Tile_31",
+        "side": "Tile_02"
+      }
+    },
+    "ground_dirt": {
+      "id": 2,
+      "tiled_id": 2,
+      "solid": true,
+      "sprites": {
+        "top": "Tile_12",
+        "side": "Tile_12"
+      }
+    },
+    "portal_grass": {
+      "id": 3,
+      "tiled_id": 3,
+      "solid": false,
+      "sprites": {
+        "top": "Tile_31",
+        "side": "Tile_31"
+      },
+      "target_map": "room2"
+    },
+    "player": {
+      "id": 100,
+      "solid": true,
+      "sprites": {
+        "top": "player_idle",
+        "side": "player_idle"
+      },
+      "animations": {
+        "idle": {"frames": [0], "speed": 1},
+        "walk": {"frames": [1, 2, 3, 4], "speed": 5},
+        "jump": {"frames": [5, 6], "speed": 4}
+      }
+    }
+  }
+}