[Keyboard] Add mazestudio jocker (#21446)

Co-authored-by: jack <0x6a73@protonmail.com>

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+# Jocker 1800
+
+![jocker1800]( https://i.imgur.com/aQEiE4Hh.jpg )
+
+PCB Replacement for Austin 1800
+
+* Keyboard Maintainer: [Maze Studio](https://github.com/mazestd)
+* Hardware Supported: Jocker PCB, Atmega32u4
+* Hardware Availability: Local Group Buy
+
+Make example for this keyboard (after setting up your build environment):
+
+    make mazestd/jocker:default
+
+Flashing example for this keyboard:
+
+    make mazestd/jocker: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 (1,0) in the matrix or Escape Key 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