[Keyboard] rart/rart45 (#11096)

* Create config.h

* Create info.json

* Create rart45.c

* Create rart45.h

* Create readme.md

* Create rules.mk

* Create keymap.c

* Create keymap.c

* Create rules.mk

* Update config.h

* Update rart45.c

* Update rart45.h

* Update rules.mk

* Update readme.md

* Update info.json

keyboards/rart/rart45/readme.md

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+# Rart45
+
+![TOP](https://user-images.githubusercontent.com/30220306/100749285-0fdd8500-3417-11eb-9b06-11a04f9de264.png)
+
+A 40% Ergo Layout Mechanical Keyboard with Atmega328p inspired by the Reviung41 by gtips and the Plaid by hsgw, based on [IMKG](https://www.facebook.com/groups/indomechanicalkeyboard/) (Indonesia Mechanical Keyboard Group).
+
+* Keyboard Maintainer: [Alabahuy](https://github.com/alabahuy)
+* Hardware Supported: RART45 PCB, Mini USB, ATMEGA328p with vusb
+* Hardware Availability: Private GB 
+
+Make example for this keyboard (after setting up your build environment):
+
+    make rart/rart45:default
+
+Flashing example for this keyboard:
+
+    make rart/rart45:default:flash
+
+## Bootloader
+use usbasploader in hgsw repository.
+https://github.com/hsgw/USBaspLoader/tree/plaid
+
+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).