feat:初步实现购买游戏接口（待完整联调）

feat：完善游戏房UI
feat：初步实现游戏引擎功能

library/src/main/java/com/chwl/library/utils/json/JsonUtils.java

@@ -7,11 +7,16 @@ import com.google.gson.Gson;
  */
 public class JsonUtils {
 
+    public static Gson gson;
+
     public static String toJson(Object object) {
+        if (gson == null) {
+            gson = new Gson();
+        }
         String result = null;
         try {
             if (object != null) {
-                result = new Gson().toJson(object);
+                result = gson.toJson(object);
             }
         } catch (Exception ex) {
             ex.printStackTrace();