Add new file

https://github.com/espressif/esp-idf-template
https://github.com/espressif/esp-idf/tree/master/examples

main/main.c

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+#include "freertos/FreeRTOS.h"
+#include "esp_wifi.h"
+#include "esp_system.h"
+#include "esp_event.h"
+#include "esp_event_loop.h"
+#include "nvs_flash.h"
+#include "driver/gpio.h"
+
+esp_err_t event_handler(void *ctx, system_event_t *event)
+{
+    return ESP_OK;
+}
+
+void app_main(void)
+{
+    nvs_flash_init();
+    tcpip_adapter_init();
+    ESP_ERROR_CHECK( esp_event_loop_init(event_handler, NULL) );
+    wifi_init_config_t cfg = WIFI_INIT_CONFIG_DEFAULT();
+    ESP_ERROR_CHECK( esp_wifi_init(&cfg) );
+    ESP_ERROR_CHECK( esp_wifi_set_storage(WIFI_STORAGE_RAM) );
+    ESP_ERROR_CHECK( esp_wifi_set_mode(WIFI_MODE_STA) );
+    wifi_config_t sta_config = {
+        .sta = {
+            .ssid = "access_point_name",
+            .password = "password",
+            .bssid_set = false
+        }
+    };
+    ESP_ERROR_CHECK( esp_wifi_set_config(WIFI_IF_STA, &sta_config) );
+    ESP_ERROR_CHECK( esp_wifi_start() );
+    ESP_ERROR_CHECK( esp_wifi_connect() );
+
+    gpio_set_direction(GPIO_NUM_4, GPIO_MODE_OUTPUT);
+    int level = 0;
+    while (true) {
+        gpio_set_level(GPIO_NUM_4, level);
+        level = !level;
+        vTaskDelay(300 / portTICK_PERIOD_MS);
+    }
+}