added choosing spaceship in singleplay

resources/config/ship_selection_menu.json

@@ -0,0 +1,64 @@
+{
+    "root": {
+      "name": "shipSelectionRoot",
+      "type": "node",
+      "children": [
+
+        {
+            "type": "TextField",
+            "name": "nicknameInput",
+            "x": 400,
+            "y": 150,
+            "width": 400,
+            "height": 50,
+            "placeholder": "Enter your nickname",
+            "fontPath": "resources/fonts/DroidSans.ttf",
+            "fontSize": 16,
+            "maxLength": 256,
+            "color": [122, 156, 198, 1],
+            "placeholderColor": [122, 156, 198, 1],
+            "backgroundColor": [15, 29, 51, 1],
+            "borderColor": [15, 29, 51, 1]
+          },
+        {
+			"type": "Button",
+			"name": "spaceshipButton",
+			"x": 300,
+			"y": 320,
+			"width": 200,
+			"height": 80,
+			"textures": {
+			  "normal": "resources/multiplayer_menu/JoinServer.png",
+			  "hover": "resources/multiplayer_menu/JoinServer.png",
+			  "pressed": "resources/multiplayer_menu/JoinServer.png"
+			}
+		  },
+        {
+			"type": "Button",
+			"name": "cargoshipButton",
+			"x": 700,
+			"y": 320,
+			"width": 200,
+			"height": 80,
+			"textures": {
+			  "normal": "resources/multiplayer_menu/JoinServer.png",
+			  "hover": "resources/multiplayer_menu/JoinServer.png",
+			  "pressed": "resources/multiplayer_menu/JoinServer.png"
+			}
+		  },
+          {
+            "type": "Button",
+            "name": "backButton",
+            "x": 449,
+            "y": 280,
+            "width": 382,
+            "height": 56,
+            "textures": {
+              "normal": "resources/multiplayer_menu/Backbutton.png",
+              "hover": "resources/multiplayer_menu/Backbutton.png",
+              "pressed": "resources/multiplayer_menu/Backbutton.png"
+            }
+          }
+      ]
+    }
+  }