[Keyboard] Added support for a new keyboard - Ishi 80 Mk0 (#19195)

keyboards/argo_works/ishi/80/mk0_avr/readme.md

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+# Ishi 80 Mk 0
+
+![argo_works/ishi/80/mk0_avr](https://i.imgur.com/TVn6zeqh.jpeg)
+
+Ishi 80 is a 60% keyboard with a SouthPaw, Mirrored Numpad. 
+
+Note: This firmware is for ATMega32U4 based daughterboards with the standard Pro-Micro footprint. It does not support the Encoder and OLED display functionality.
+
+* Keyboard Maintainer: [Jason Devadoss](https://github.com/jasonj2232)
+* Hardware Supported: Ishi80 Mk 0 with standard Pro Micro footprint daughterboards
+* Hardware Availability: -
+
+Make example for this keyboard (after setting up your build environment):
+
+    make argo_works/ishi/80/mk0_avr:default
+
+Flashing example for this keyboard:
+
+    make argo_works/ishi/80/mk0_avr: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 `QK_BOOT` if it is available