[Keyboard] add dynamis keyboard (#15994)

Co-authored-by: Drashna Jaelre <[email protected]>
Co-authored-by: Ryan <[email protected]>

keyboards/bbrfkr/dynamis/readme.md

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+# dynamis
+
+## general information
+![dynamis](https://i.imgur.com/q2C3D2ul.jpg)
+
+Gasket mounted 65% row staggered keyboard integrated a trackball
+
+* Keyboard Maintainer: [bbrfkr](https://github.com/bbrfkr/)
+* Hardware Supported: dynamis PCBs
+* Hardware Availability: http://github.com/bbrfkr/keyboards
+
+## 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
+
+## build and flash firmware
+
+Make example for this keyboard (after setting up your build environment):
+
+    make bbrfkr/dynamis:default
+
+Flashing example for this keyboard:
+
+    make bbrfkr/dynamis: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).