added example for on demand config portal

cleanup

examples/OnDemandConfigPortal/OnDemandConfigPortal.ino

@@ -0,0 +1,67 @@
+#include <ESP8266WiFi.h>          //https://github.com/esp8266/Arduino
+
+//needed for library
+#include <DNSServer.h>
+#include <ESP8266WebServer.h>
+#include <WiFiManager.h>          //https://github.com/tzapu/WiFiManager
+
+
+//callback notifying us of the need to save config
+void saveConfigCallback () {
+  Serial.println("Should save config");
+}
+
+
+void setup() {
+  // put your setup code here, to run once:
+  Serial.begin(115200);
+  Serial.println("\n Starting");
+
+  //read gpio 4 state on startup
+  pinMode(4, INPUT);
+  int pinState = digitalRead(4);
+
+  //if gpio 4 is high startup config mode
+  if (pinState == LOW) {
+    //WiFiManager
+    //Local intialization. Once its business is done, there is no need to keep it around
+    WiFiManager wifiManager;
+
+    //set config save notify callback
+    wifiManager.setSaveConfigCallback(saveConfigCallback);
+
+    //reset settings - for testing
+    //wifiManager.resetSettings();
+
+    //sets timeout until configuration portal gets turned off
+    //useful to make it all retry or go to sleep
+    //in seconds
+    //wifiManager.setTimeout(120);
+
+    //it starts an access point with the specified name
+    //here  "AutoConnectAP"
+    //and goes into a blocking loop awaiting configuration
+
+    //WITHOUT THIS THE AP DOES NOT SEEM TO WORK PROPERLY
+    WiFi.mode(WIFI_STA);
+    
+    if (!wifiManager.startConfigPortal("OnDemandAP")) {
+      Serial.println("failed to connect and hit timeout");
+      delay(3000);
+      //reset and try again, or maybe put it to deep sleep
+      ESP.reset();
+      delay(5000);
+    }
+
+    //if you get here you have connected to the WiFi
+    Serial.println("connected...yeey :)");
+  }
+
+
+}
+
+void loop() {
+  // put your main code here, to run repeatedly:
+
+
+}