[Keymap] BDN9 keymap (#15924)

keyboards/keebio/bdn9/keymaps/lickel/readme.md

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+# lickel's BDN9 keymap
+
+- Via support is enabled by default
+- Changing layers to non-zero changes the RGBs to breathing colors
+- Changing to layer 0 resets the RGBs to EEPROM settings
+- Layer 0 encoders are: Hue, Saturation, Value
+- Other layers are: Volume, Arrow, Pg up/down
+
+- Layer 0: Media Controls & RGB Effects
+- Layer 1: Xcode Debugging
+- Layers 2 and 3: Reserved for Via
+
+## Changelog
+
+### 1/17/2022 - 1.0
+
+- Initial release