Add OTA update feature

This sketch provide functionality for OTA firmware upgrade.

libraries/Update/src/HttpsOTAUpdate.h

@@ -0,0 +1,21 @@
+#include "esp_http_client.h"
+#define HttpEvent_t esp_http_client_event_t
+
+typedef enum
+{
+    HTTPS_OTA_IDLE,
+    HTTPS_OTA_UPDATING,
+    HTTPS_OTA_SUCCESS,
+    HTTPS_OTA_FAIL,
+    HTTPS_OTA_ERR
+}HttpsOTAStatus_t;
+
+class HttpsOTAUpdateClass {
+
+    public:
+    void begin(const char *url, const char *cert_pem, bool skip_cert_common_name_check = true);
+    void onHttpEvent(void (*http_event_cb_t)(HttpEvent_t *));
+    HttpsOTAStatus_t status();
+};
+
+extern HttpsOTAUpdateClass HttpsOTA;