[Keyboard] Add Dosa40RGB + dtisaac01 (#14476)

keyboards/dtisaac/dosa40rgb/readme.md

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+# dosa40rgb
+
+![dosa40rgb](https://i.imgur.com/NfuF82nh.jpg)
+
+A 40 percent keyboard dosa40rgb Bluetooth Low Energy
+
+* Keyboard Maintainer: [DTIsaac](https://github.com/daotakisaac)
+* Hardware Supported: ATmega32U4 + AdafruitBLE SPI
+
+Make example for this keyboard (after setting up your build environment):
+
+    make dtisaac/dosa40rgb:default
+
+Flashing example for this keyboard:
+
+    make dtisaac/dosa40rgb: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 2 ways:
+
+* **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 `RESET` if it is available