初始提交，实现WebSocket聊天室基本功能

src/main/java/cn/airnan/dg/controller/indexController.java

@@ -0,0 +1,18 @@
+
+package cn.airnan.dg.controller;
+
+import org.springframework.stereotype.Controller;
+import org.springframework.web.bind.annotation.RequestMapping;
+
+/**
+ * Web首页
+ */
+@Controller
+public class indexController {
+
+    @RequestMapping("/")
+    public String index() {
+        return "index.html";
+    }
+
+}