[Keyboard] Create the battleship gamepad keyboard. (#14551)

Co-authored-by: Drashna Jaelre <drashna@live.com>
Co-authored-by: Ryan <fauxpark@gmail.com>

keyboards/handwired/battleship_gamepad/readme.md

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+# Battleship Gamepad
+
+![Battleship Gamepad](https://imgur.com/FCpQfzQ.jpg)
+
+A hand-wired 3d-printed mechanical keyboard intended for one hand with an analog thumbstick for movement. The layout matches the left side of large "battleship" keyboards with their extra bank of 2x5 1u F keys.
+
+Build instructions and 3d printer files can be found in the [project github repo](https://github.com/abraini-Nascent/battleship_gamepad)
+
+* Keyboard Maintainer: [arbraini](https://github.com/abraini-Nascent)
+* Hardware Supported: Arduino Pro Micro
+* Features: 40 keys in an ortho layout and an analog thumbstick.
+
+Make example for this keyboard (after setting up your build environment):
+
+    make handwired/battleship_gamepad:default
+    
+Flashing example for this keyboard:
+
+    make handwired/battleship_gamepad:flash
+
+## Bootloader
+
+Enter the bootloader in 3 ways:
+
+* **Bootmagic reset**: Hold down the key at (0,0) in the matrix (the top left key in the 2x5 bank) and plug in the keyboard.
+* **Physical reset button**: Briefly press the button on the back of the PCB - some may have pads you must short instead.
+* **Keycode in layout**: Press the key mapped to `RESET`.  In the default layout this is the key at (0,0) on layer 1.
+
+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).