Added instructions for how to build and flash the firmware with teensy_cli.

keyboards/ergodox/readme.md

@@ -69,12 +69,13 @@ files.  Check them out with:
 
 The Ez uses the [Teensy Loader](https://www.pjrc.com/teensy/loader.html).
 
-Linux users need to modify udev rules as described on the Teensy Linux page.
+Linux users need to modify udev rules as described on the Teensy Linux page (which page?).
-Some distributions provide a binary, maybe called `teensy-loader-cli`).
+Some distributions provide a binary, maybe called `teensy-loader-cli`.
 
 To flash the firmware:
 
   - Build the firmware with `make keymapname`, for example `make default`
+
   - This will result in a hex file called `ergodox_ez_keymapname.hex`, e.g.
     `ergodox_ez_default.hex`
 
@@ -87,6 +88,15 @@ To flash the firmware:
 
   - Click the button in the Teensy app to download the firmware.
 
+To flash with ´teensy-loader-cli´:
+
+  - Build the firmware with `make keymapname`, for example `make default`
+
+  - Run ´<path/to/>teensy_loader_cli --mcu=atmega32u4 -w ergodox_ez_<keymap>.hex´
+
+  - Press the Reset button by inserting a paperclip gently into the reset hole
+    in the top right corder.
+
 ## ErgoDox Infinity
 
 The Infinity is two completely independent keyboards, and needs to be flashed