At101ish (#25072)

* Dell AT101 replacement pcb support

* Update keyboards/at101ish/readme.md

Co-Authored-By: fauxpark <fauxpark@gmail.com>

* remove empty src clause in makefile

* feature: Update at101ish to qmk v0.28

* feature: Add osdetecting keymap variant.

* refactor: Move at101ish keyboard to handwired folder.

* fix: Adjust at101ish readme-

* fix: review changes.

* chore: Remove unneeded feature.

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

1 files changed, 25 insertions, 0 deletions

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+# AT101(-ish)
+
+A replacement PCB for Dell AT101 family. (In theory) supports AT101, AT101W, AT102, AT102W, maybe other Bigfoot platform boards.
+
+Keyboard Maintainer: QMK Community and Henrik O. Sørensen  
+Hardware Supported: AT101(ish) PCB  
+Hardware Availability: https://github.com/henrikosorensen/keyboard_pcbs/tree/master/at101_pcb
+
+Make example for this keyboard (after setting up your build environment):
+
+    make handwired/at101ish:default
+
+Flashing example for this keyboard:
+    
+    make handwired/at101ish: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 2 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 programming button on the teensy 2.0 PCB.
+