Implemented type enum

gui-chess/src/main/java/com/gitea/lin/model/Type.java

@@ -0,0 +1,10 @@
+package com.gitea.lin.model;
+
+public enum Type {
+    PAWN,
+    KING,
+    QUEEN,
+    ROOK,
+    BISHOP,
+    KNIGHT,
+}