Started some DHT22 stuff

Haven't tested it at all

main/main.c

@@ -11,7 +11,7 @@
 
 void app_main(void)
 {
-  int ret = dht_read();
+  int ret = dht22_temperature();
   printf("Hello world! - dhtRet: %i\n", ret);
   for (int i = 10; i >= 0; i--) {
       printf("Restarting in %d seconds...\n", i);