Add support for Atreus running on A-Star

keyboard/atreus/README.md

@@ -1,10 +1,6 @@
 atreus keyboard firmware
 ======================
 
-## Note
-
-This is for the Teensy2 hand wired boards only.
-
 ## Quantum MK Firmware
 
 You have access to a bunch of goodies! Check out the Makefile to enable/disable some of the features. Uncomment the `#` to enable them. Setting them to `no` does nothing and will only confuse future you.
@@ -14,6 +10,12 @@ You have access to a bunch of goodies! Check out the Makefile to enable/disable
     # UNICODE_ENABLE = yes # Unicode support - this is commented out, just as an example. You have to use #, not //
     BLUETOOTH_ENABLE = yes # Enable Bluetooth with the Adafruit EZ-Key HID
 
+## Atreus specific information
+
+These configuration files are specifically for the Atreus keyboards created by Phil Hagelberg (@technomancy). This keyboard is available in two variants: one powered by a Teensy 2, one powered by an A-Star. This repository currently assumes that you have a Teensy 2 powered Atreus. If you are using an A-Star, specify that by adding `ASTAR=yes` to your `make` commands.
+
+If you are coming from the [atreus-firmware](https://github.com/technomancy/atreus-firmware), we've also brought forward the `make upload` command for you to use.
+
 ## Quick aliases to common actions
 
 Your keymap can include shortcuts to common operations (called "function actions" in tmk).