Added some code snippets

snippets/led/code.txt

@@ -0,0 +1,21 @@
+int blink_led(void) {
+    int ret;
+
+    if (!gpio_is_ready_dt(&led)) {
+        return 0;
+    }
+
+    ret = gpio_pin_configure_dt(&led, GPIO_OUTPUT_ACTIVE);
+    if (ret < 0) {
+        return 0;
+    }
+
+    while (1) {
+        ret = gpio_pin_toggle_dt(&led);
+        if (ret < 0) {
+            return 0;
+        }
+        k_msleep(1000);
+    }
+    return 0;
+}

snippets/led/imports.txt

@@ -0,0 +1,2 @@
+#include <zephyr/drivers/gpio.h>
+#define LED0_NODE DT_ALIAS(led0)