added headers for setup page

lib/WiFiManagerParameters/HeaderParameter.h

@@ -0,0 +1,27 @@
+#pragma once
+#include <WiFiManager.h>
+
+
+class HeaderParameter : public WiFiManagerParameter {
+public:
+  HeaderParameter(const char* title) {
+    WiFiManagerParameter("");
+    byte size = strlen(title) + strlen(this->tpl) + 1;
+    this->buffer = new char[size];
+    this->title = title;
+  }
+
+  ~HeaderParameter() {
+    delete[] this->buffer;
+  }
+
+  const char* getCustomHTML() const override {
+    sprintf(this->buffer, this->tpl, title);
+    return this->buffer;
+  }
+
+protected:
+  const char* title;
+  char* buffer;
+  const char* tpl = "<div class=\"bheader\">%s</div>";
+};