Add Rart75 hotswap and support via (#16619)

* Add Keyboard Rart75 Hotswap version

* Update readme

* Update config and readme

* Update info.json

* update readme and keymaps

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+# [RART 75 Hotswap](https://github.com/alabahuy/RART/tree/master/RART75)
+
+![RART 75](https://i.imgur.com/FVWlm8Uh.jpeg)
+
+75% pcb with encoder, based on IMKG (Indonesia Mechanical Keyboard Group)
+
+* Keyboard Maintainer: [Alabahuy](https://github.com/alabahuy)
+* Hardware Supported: RART75 PCB, Atmega32a, Type C, Encoders
+* Hardware Availability: Private GB
+
+Make example for this keyboard (after setting up your build environment):
+
+    make rart/rart75hs:default
+
+Flashing example for this keyboard:
+
+    make rart/rart75hs:default:flash
+
+## Bootloader
+
+Enter the bootloader in 3 ways:
+
+* To Enter the bootloader you can short and hold boot pin, short reset pin, release reset and boot pin. 
+
+* Bootmagic reset, hold down the key at (0,0) in the matrix (ESC) and plug in the keyboard. 
+
+* Bootloader reset on the matrix, hold down key at (0,1) and plug in the keyboard
+
+
+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).