add simple web server for configuration

WebCfgServer.h

@@ -0,0 +1,28 @@
+#pragma once
+
+#include <WiFiServer.h>
+
+enum class TokenType
+{
+    NONE,
+    MQTT_SERVER,
+};
+
+class WebCfgServer
+{
+public:
+    WebCfgServer();
+    ~WebCfgServer() = default;
+
+    void initialize();
+    void update();
+
+
+private:
+    void serveHtml(WiFiClient& client);
+    TokenType getParameterType(char*& token);
+
+    WiFiServer _wifiServer;
+
+    bool _enabled = true;
+};