Add link to new API docs

Author: glynhudson

readme.md

@@ -4,6 +4,7 @@
 
 - *For the older WiFi V2.x ESP8266 version (pre June 2020), see the [v2 firmware repository](https://github.com/openevse/ESP8266_WiFi_v2.x/)*
 
+- **For latest API documentation see the new [Spotlight.io OpenEVSE WiFi documentation page](https://openevse.stoplight.io/docs/openevse-wifi-v4/ZG9jOjQyMjE5ODI-open-evse-wi-fi-esp-32-gateway-v4)**
 
 ![main](docs/main2.png)
 
@@ -235,6 +236,8 @@ MQTT can also be used to control the OpenEVSE, see RAPI MQTT below.
 
 ### RAPI API (Not Recommended)
 
+**For latest API documentation see the new [Spotlight.io OpenEVSE WiFi documentation page](https://openevse.stoplight.io/docs/openevse-wifi-v4/ZG9jOjQyMjE5ODI-open-evse-wi-fi-esp-32-gateway-v4)**
+
 RAPI commands can be used to control and check the status of all OpenEVSE functions. RAPI commands can be issued via the direct serial, web-interface, HTTP and MQTT. We recommend using RAPI over MQTT.
 
 **IMPORTANT: It is no longer recommended to use RAPI API if EVSE also had a WiFi module fitted, since use of the RAPI API will conflict with the WiFi module, instead the HTTP API should be used to control the WiFi module instead of the controller via RAPI. User RAPI API will be disabled in future releases**