[Keyboard] Add miniashen40 (#14238)

Co-authored-by: Joel Challis <git@zvecr.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/mechanickeys/miniashen40/readme.md

@@ -0,0 +1,40 @@
+# Mini Ashen 40
+
+![Mini Ashen 40](https://i.imgur.com/0k3gFZCh.jpeg)
+
+![Mini Ashen 40](https://i.imgur.com/B1w8qwPh.jpeg)
+
+![Mini Ashen 40](https://i.imgur.com/LqxXW0Rh.jpeg)
+
+A 40% keyboard with some extras
+  - Arrows
+  - Mini macro cluster
+  - Full assembly with only through hole components
+
+* Keyboard Maintainer: [jfescobar18](https://github.com/jfescobar18)
+* Hardware Supported: Mini Ashen 40 PCB and Case
+* Hardware Availability: [MechanicKeys](https://www.facebook.com/MechanicKeys-104963764775280)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make mechanickeys/miniashen40:default
+
+Flashing example for this keyboard:
+
+    make mechanickeys/miniashen40: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).
+
+## Bootloader
+
+Enter the bootloader in 3 ways:
+
+* **Bootmagic reset**: Hold down the key at (0,0) in the matrix (usually the top left key or Escape) and plug in the keyboard
+* **Physical**: 
+  1. Press and hold `BOOT` switch
+  2. Tap `RESET` switch
+  3. Release `BOOT` switch
+* **Keycode in layout**: Press the key mapped to `RESET` if it is available
+
+## Flash bootloader
+* [Follow this instructions](https://github.com/jfescobar18/USBaspLoader)