add desktop computer prerequisite (#112)

* add desktop computer prerequisite

* wait there should be a comma here

* forgot about linux

Author: undefined06855

getting-started/prerequisites.md

@@ -9,5 +9,6 @@ Before getting started developing with the Geode SDK, there are a few prerequisi
 
  * Prior C++ knowledge is **HIGHLY** recommended. Learning C++ alongside modding is *very* hard.
  * Installing [Geode](https://geode-sdk.org/install/) itself! You want to test your own mods, don't you?
+ * A desktop device to develop mods, either a Windows computer, Mac or Linux device. We will **NOT** be providing support for developing mods on mobile, Android or iOS!
 
 It is recommended that you follow the tutorials on this chapter in order.