update README to explain new platforms at the bare minimum

Author: ByteSizedFox

README.md

@@ -1,5 +1,5 @@
 A smaller version of dectalk intended for portability between platforms
-supports windows, unix-like operating systems, and Android
+supports windows, unix-like operating systems (such as Linux, MacOS, BSD, and others), and Android
 
 dependencies for gui:
 ```
@@ -31,3 +31,9 @@ to compile for windows with speak gui demo
 premake5 gmake --build-speak=yes
 make config=release_win64
 ```
+
+see the [android-develop](https://github.com/dectalk/DECtalkMini/tree/android-develop) branch for the android source
+
+to compile for rpi pico, install the pico SDK and use cmake in the pico folder
+
+to compile for gameboy advance, install gba-dev from pacman following [this guide] (https://devkitpro.org/wiki/Getting_Started) and use make in the gba folder