[Keyboard] Baion 808 (#19690)

Co-authored-by: jack <0x6a73@protonmail.com>
Co-authored-by: Joel Challis <git@zvecr.com>
Co-authored-by: yiancar <yiancar@gmail.com>

keyboards/baion_808/readme.md

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+# Baion 808
+
+This is a standard TKL layout PCB. It supports VIA.
+
+* Keyboard Maintainer: [Yiancar](http://yiancar-designs.com/) and on [GitHub](https://github.com/yiancar)
+* Hardware Supported: A TKL keyboard with STM32F072CB
+* Hardware Availability: https://baionlenja.com 
+
+![Layer 0](https://i.imgur.com/IhbvSZ1.png)
+
+## Instructions
+
+### Build
+
+Make example for this keyboard (after setting up your build environment):
+
+    make baion_808:default
+
+Flashing example for this keyboard:
+
+    make baion_808: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).
+
+### Reset
+
+- Unplug
+- Hold Escape
+- Plug In
+- Unplug
+- Release Escape
+
+### Flash
+
+- Unplug
+- Hold Escape
+- Plug In
+- Flash using QMK Toolbox or CLI (`make baion_808:<keymap>:flash`)