[Keyboard] Add Vertex 40% (#15323)

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+# Vertex
+
+![vertex](https://i.imgur.com/drRZO54l.jpg)
+
+3D printed Vortex 40% inspired screwless exterior, top-mount keyboard
+
+* Keyboard Maintainer: [kb-elmo](https://github.com/kb-elmo)
+* Hardware Supported: Vertex rev.1
+* Hardware Availability: [Open source project](https://github.com/kb-elmo/Vertex)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make kb_elmo/vertex:default
+
+Flashing example for this keyboard:
+
+    make kb_elmo/vertex: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
+
+* **Bootmagic reset**: Hold down the top left key and plug in the keyboard
+* **Physical reset button**: Briefly press the button labeled "Reset" on the back of the PCB
+* **Keycode in layout**: Press the key mapped to `RESET` if it is available