[Keyboard] Add Osborne 1 handwired keyboard (#18397)

Co-authored-by: Drashna Jaelre <drashna@live.com>

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+# osborne1
+
+![osborne1](https://i.imgur.com/221nQ5Eh.jpeg)
+
+The Osborne keyboard doesn't contain any electronics, so the pins of the 8x8 keyboard matrix are easily available right on the normal connector. 17 jumper wires and a Feather BlueFruit is all the additional hardware needed.
+
+* Keyboard Maintainer: [crackmonkey](https://github.com/crackmonkey)
+* Hardware Supported: Adafruit Feather BlueFruit 32u4
+* Hardware Availability: E-waste
+
+Make example for this keyboard (after setting up your build environment):
+
+    make osborne1:default
+
+Flashing example for this keyboard:
+
+    make osborne1: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:
+
+* **Physical reset button**: Briefly press the button on the Feather