Added the /ping route

src/main/java/de/gnmyt/mcdash/panel/routes/PingRoute.java

@@ -0,0 +1,24 @@
+package de.gnmyt.mcdash.panel.routes;
+
+import de.gnmyt.mcdash.api.handler.DefaultHandler;
+import de.gnmyt.mcdash.api.http.Request;
+import de.gnmyt.mcdash.api.http.ResponseController;
+
+public class PingRoute extends DefaultHandler {
+
+    @Override
+    public String path() {
+        return "ping";
+    }
+
+    /**
+     * Simple ping route
+     * @param request The request object from the HttpExchange
+     * @param response The Response controller from the HttpExchange
+     */
+    @Override
+    public void get(Request request, ResponseController response) {
+        response.text("Pong!");
+    }
+
+}