[Keyboard] Add damapad (#16443)

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

keyboards/bolsa/damapad/readme.md

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+# Damapad
+
+A Macropad by Bolsa Supply
+
+-   Keyboard Maintainer: [matthewdias](https://github.com/matthewdias)
+-   Hardware Supported: Damapad PCB
+
+Make example for this keyboard (after setting up your build environment):
+
+    make bolsa/damapad:default
+
+Flashing example for this keyboard:
+
+    make bolsa/damapad: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:
+
+-   **Physical reset button**: Briefly press the button on the back of the PCB (or short the reset/ground pads, should a tactile button not be installed)