add new keyboard atset (#17195)

Co-authored-by: zvecr <git@zvecr.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

1 files changed, 24 insertions, 0 deletions

diff --git a/keyboards/atset/at9/readme.md b/keyboards/atset/at9/readme.md
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+# ATSET AT9
+
+A special 9 key keyboard powered by QMK.
+
+* Keyboard Maintainer: [ATSET](https://github.com/anubhavd7)
+* Hardware Supported: ATmega32u4
+
+Make example for this keyboard (after setting up your build environment):
+
+     make atset/at9:default
+     
+Flashing example for this keyboard:
+
+    make atset/at9:default:flash
+
+See the [build environment setup](https://docs.qmk.fm/#/getting_started_build_tools) and the [make instructions](https://docs.qmk.fm/#/getting_started_make_guide) for more information. Brand new to QMK? Start with our [Complete Newbs Guide](https://docs.qmk.fm/#/newbs).
+
+## Bootloader
+
+Enter the bootloader in 3 ways:
+
+* **Bootmagic reset**: Hold down the key at (0,0) in the matrix (usually the top left key or Escape) and plug in the keyboard
+* **Physical reset button**: Briefly press the button on the back of the PCB - some may have pads you must short instead
+* **Keycode in layout**: Press the key mapped to `RESET` if it is available