[Keyboard] Add support for Alveus MX PCB (#21238)

Co-authored-by: jack <0x6a73@protonmail.com>

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+# Alveus
+
+![Alveus PCB](https://i.imgur.com/tZKcLiMh.png)
+
+A MX PCB for Alveus FRL keyboard.
+
+* Keyboard Maintainer: [Mechlovin' Studio](https://mechlovin.studio/)
+* Hardware Supported: Alveus, APM32F103 
+* Hardware Availability: [Densus](https://www.instagram.com/densusdesign/)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make densus/alveus/mx:default
+
+Flashing example for this keyboard:
+
+    make densus/alveus/mx: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).
+
+Enter the bootloader in 4 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
+* **Bootloader reset**: Hold down the key at (0,13) in the matrix (Backspace) and plug in the keyboard
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available
+* **Hardware reset**: Press reset button (located on the bottom side of the PCB) 
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