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, 17 insertions, 0 deletions

diff --git a/keyboards/acheron/shark/readme.md b/keyboards/acheron/shark/readme.md
new file mode 100644
index 0000000000..962a73c6d1
--- /dev/null
+++ b/keyboards/acheron/shark/readme.md
@@ -0,0 +1,17 @@
+# Acheron Aχξρων 40-SM-O-MX-TH-WI (Codename "SharkPCB") QMK firmware
+
+<p align="center">
+  <img align="middle" src="https://raw.githubusercontent.com/Gondolindrim/acheronLibrary/master/graphics/acheronLong.png"  width="400"> 
+</p>
+
+This is the QMK firmware repository for the Shark, updated until [revision Alpha](https://github.com/Gondolindrim/SharkPCB/releases/tag/Alpha).
+
+The SharkPCB is an Open-Hardware guidelines compliant PCB which files can be found at [this link](https://github.com/Gondolindrim/SharkPCB). Its designer and maintainer is [Gondolindrim](https://github.com/Gondolindrim).
+
+See the [AcheronDocs](https://gondolindrim.github.io/AcheronDocs/shark/intro.html) page for the SharkPCB full documentation.
+
+Make example for this keyboard (after setting up your build environment):
+
+    make acheron/shark: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).