[Keyboard] Carpolly (#15778)

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

keyboards/handwired/carpolly/readme.md

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+# carpolly
+
+![carpool](https://i.imgur.com/w691sNnh.jpg)
+
+* Keyboard Maintainer: Paul Enrico N. Viola (https://github.com/PollyV1)
+* Hardware Supported: Teensy 2 controller
+* Hardware Availability: [PollyV1] https://github.com/PollyV1/Carpolly
+
+carpolly - a handwired keyboard on a teensy 2 controller
+
+## Make 
+
+Make example for this keyboard (after setting up your build environment):
+
+    make handwired/carpolly:default
+
+## Flashing
+
+Flashing example for this keyboard:
+
+    make handwired/carpolly: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 2 ways:
+
+* **Physical reset button**: Briefly press the RESET button on the controller.
+* **Keycode in layout**: Longpress ALT + ESC