Updated HTTP request API (markdown)

HTTP-request-API.md

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 WLED's HTTP API allows you to set many properties of your lights, even more than the index page UI supports, via a simple GET web request.
 
+_Unsure how all this API stuff works? Check out [this amazing guide](https://tynick.com/blog/01-28-2020/controlling-wled-with-raspberry-pi-using-the-wled-api/) by Tyson!_
+
 The basic URL scheme is: `[ipadress]/win`. This will return an XML file with some current values (see bottom of page).
 Parameters can be added to control some of the variables.
 - Example (AP): `192.168.4.1/win&A=255` sets the brightness to maximum