Updated readme

README.md

@@ -42,6 +42,17 @@ Keyboard based on standard teensy "Keypad" library for button scanning, standard
   - LED flashing = Caps Lock activated
   - LED on = Gui key lock activated
 
+## Build environment
+
+- Platformio
+  - env: teensylc
+  - platform: teensy
+  - board: teensylc
+  - framework: arduino
+- Flashing via Teensy USB bootloader
+  - Pressing boot button on teensy
+  - Pressing all four corners on the keyboard
+
 ## Hardware
 
 [Schematics](build/cmdr_mainboard_v1.pdf)