add wifi manager esp32 (#414)

* add wifi manager esp32

lib/WiFiManager/examples/Basic/Basic.ino

@@ -0,0 +1,39 @@
+#include <WiFiManager.h> // https://github.com/tzapu/WiFiManager
+
+void setup() {
+    // put your setup code here, to run once:
+    Serial.begin(115200);
+    
+    // WiFi.mode(WiFi_STA); // it is a good practice to make sure your code sets wifi mode how you want it.
+
+    //WiFiManager, Local intialization. Once its business is done, there is no need to keep it around
+    WiFiManager wm;
+
+    //reset settings - wipe credentials for testing
+    //wm.resetSettings();
+
+    // Automatically connect using saved credentials,
+    // if connection fails, it starts an access point with the specified name ( "AutoConnectAP"),
+    // if empty will auto generate SSID, if password is blank it will be anonymous AP (wm.autoConnect())
+    // then goes into a blocking loop awaiting configuration and will return success result
+
+    bool res;
+    // res = wm.autoConnect(); // auto generated AP name from chipid
+    // res = wm.autoConnect("AutoConnectAP"); // anonymous ap
+    res = wm.autoConnect("AutoConnectAP","password"); // password protected ap
+
+    if(!res) {
+        Serial.println("Failed to connect");
+        // ESP.restart();
+    } 
+    else {
+        //if you get here you have connected to the WiFi    
+        Serial.println("connected...yeey :)");
+    }
+
+}
+
+void loop() {
+    // put your main code here, to run repeatedly:
+    
+}