[Keyboard] Add Aves60 (#15770)

keyboards/aves60/readme.md

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+# aves60
+
+![Aves60](https://i.imgur.com/U5UpFAVl.jpg)
+
+A universally compatible 60% PCB.
+
+* Keyboard Maintainer: [Evelien Dekkers](https://github.com/evyd13)
+* Hardware Supported: Aves60 PCB
+* Hardware Availability: [I/O Keyboards](https://iokeyboards.eu/)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make aves60:default
+
+Flashing example for this keyboard:
+
+    make aves60: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 space bar and plug in the keyboard
+* **Physical reset button**: Briefly press the button on the back of the PCB
+* **Keycode in layout**: Press the key mapped to `RESET` if it is available