Added the ESP-wifi-config submodule to the ESP-RTOS and also add a example

examples/wifi-config-v2/main.c

@@ -0,0 +1,19 @@
+#include <stdio.h>
+#include <esp/uart.h>
+
+#include "wifi_config.h"
+
+
+void on_wifi_event(wifi_config_event_t event) {
+    if (event == WIFI_CONFIG_CONNECTED) {
+        printf("Connected to WiFi\n");
+    } else if (event == WIFI_CONFIG_DISCONNECTED) {
+        printf("Disconnected from WiFi\n");
+    }
+}
+
+void user_init(void) {
+    uart_set_baud(0, 115200);
+
+    wifi_config_init2("my-accessory", NULL, on_wifi_event);
+}