examples: add otatool and parttool examples

examples/system/ota/otatool/main/otatool_main.c

@@ -0,0 +1,26 @@
+/* OTA Tool example
+
+   This example code is in the Public Domain (or CC0 licensed, at your option.)
+
+   Unless required by applicable law or agreed to in writing, this
+   software is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
+   CONDITIONS OF ANY KIND, either express or implied.
+*/
+#include "esp_system.h"
+#include "esp_log.h"
+#include "esp_ota_ops.h"
+#include "esp_partition.h"
+
+static const char *TAG = "example";
+
+void app_main()
+{
+    ESP_LOGI(TAG, "OTA Tool Example");
+
+    const esp_partition_t *running = esp_ota_get_running_partition();
+
+    // Display the running partition
+    ESP_LOGI(TAG, "Running partition: %s", running->label);
+
+    ESP_LOGI(TAG, "Example end");
+}