Add httpd app details to the readme

README.md

@@ -135,6 +135,8 @@ App|Description
 [picow_freertos_iperf_server_sys](pico_w/freertos/iperf)| Runs an "iperf" server for WiFi speed testing under FreeRTOS in NO_SYS=0 (i.e. full FreeRTOS integration) mode. The LED is blinked in another task
 [picow_freertos_ping_nosys](pico_w/freertos/ping)| Runs the lwip-contrib/apps/ping test app under FreeRTOS in NO_SYS=1 mode.
 [picow_freertos_iperf_server_sys](pico_w/freertos/iperf)| Runs the lwip-contrib/apps/ping test app under FreeRTOS in NO_SYS=0 (i.e. full FreeRTOS integration) mode. The test app uses the lwIP \em socket API in this case. 
+[picow_freertos_httpd_nosys](picow/freertos/httpd)| Runs the lwip httpd example under FreeRTOS in NOSYS=1 mode
+[picow_freertos_httpd_sys](picow/freertos/httpd)| Runs the lwip httpd example under FreeRTOS in NOSYS=1 mode
 
 ### PIO