Add multi-application support

src/application/blinky/main.c

@@ -0,0 +1,26 @@
+#include <stdbool.h>
+#include <limits.h>
+#include "nrf_delay.h"
+#include "boards.h"
+#include "platform/narf52/narf52_dk.h"
+ 
+#include "driver.h"
+ 
+int main(void)
+{
+    drv_open(&led_1);
+    drv_open(&led_2);
+    drv_open(&led_3);
+    drv_open(&led_4);
+
+    while(true) {
+        for(unsigned int i = 0; i < UINT_MAX; i++) {
+            char x = 0x30 | (char)(1 & i);
+            drv_write(&led_1, &x, 1);
+            drv_write(&led_2, &x, 1);
+            drv_write(&led_3, &x, 1);
+            drv_write(&led_4, &x, 1);
+            nrf_delay_ms(500);
+        }
+    }
+}