Rename keyboard-level readmes to lower-case (#10759)

This is the recommendation in the [PR
Checklist](https://docs.qmk.fm/#/pr_checklist?id=keyboard-prs) and it
will make working with them easier in the CLI/API/etc.

1 files changed, 41 insertions, 0 deletions

diff --git a/keyboards/aplx6/readme.md b/keyboards/aplx6/readme.md
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+# Aplx6
+
+![Front](https://i.imgur.com/flhSvAG.png)  
+![Back](https://i.imgur.com/PXqNmUh.png)
+   
+A stylish (2x3) 6-key MediaPad for your music and browser shortcuts. Designed to be assembled as a sandwich with a blank PCB, using M2.5 screws and spacers, your choice of MX- or Alps-compatible switches, and 1N4148 diodes.
+
+
+## RGB Underglow (WS2812)
+
+Just wire them to any of the unused ProMicro pins. Don't forget to edit-uncomment the `config.h` and the `rules.mk` for RGB underglow support, or even add your own functions and modes. Used pins can be found in `config.h` or in the [KiCad Schematic](https://github.com/Aplyard/Aplx6/blob/master/kiCad/xd6.sch). All ProMicro pins can be found [here](https://golem.hu/article/pro-micro-pinout/) along with the +2 pins mod.
+
+* Keyboard Maintainer: [Aplyard](https://github.com/Aplyard)
+* Hardware Supported: Aplx6 PCB, Pro Micro (ATmega32U4)
+* Hardware Availability: [GitHub](https://github.com/Aplyard/Aplx6)
+
+Make example for this keyboard (after setting up your build environment):
+
+     make aplx6:default
+
+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).
+
+---  
+****Designed in**:**  
+[KiCad](https://github.com/KiCad)  
+
+**Components Footprints & Libraries :**  
+[keebs.pretty](https://github.com/egladman/keebs.pretty)  
+[keyboard_parts.pretty
+](https://github.com/tmk/keyboard_parts.pretty)  
+[ProMicro KiCad](https://github.com/Biacco42/ProMicroKiCad)  
+
+**Usefull Links:**  
+[Qmk Online Configurator](https://config.qmk.fm/#)  
+
+**Alternatives of qmk that worked for me:**  
+[Keyboard Layout Editor](http://www.keyboard-layout-editor.com/#/)   
+[Keyboard Plate & Case Builder](http://builder.swillkb.com/)  
+[Firmware Builder](https://kbfirmware.com/)      
+
+---