add abstraction layer for webserver

webserver/AbstractWebServer.h

@@ -0,0 +1,20 @@
+#pragma once
+
+#include "EthernetWebServer.h"
+
+class AbstractWebServer
+{
+public:
+    explicit AbstractWebServer(int port) {};
+
+    virtual void begin() = 0;
+    virtual bool authenticate(const char * username, const char * password) = 0;
+    virtual void requestAuthentication(HTTPAuthMethod mode, const char* realm, const String& authFailMsg) = 0;
+    virtual void requestAuthentication() = 0;
+    virtual void send(int code, const char* content_type, const String& content) = 0;
+    virtual void on(const Uri &uri, EthernetWebServer::THandlerFunction handler) = 0;
+    virtual int args() = 0;
+    virtual String arg(int i) = 0;
+    virtual String argName(int i) = 0;
+    virtual void handleClient() = 0;
+};