[Keyboard] Acacia keyboard (#19532)

keyboards/handwired/acacia/readme.md

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+# Acacia
+
+A pseudo-split keyboard with 2+4x3+2 vertically staggered keys and 4+1 thumb keys for each hand.
+
+* Keyboard Maintainer: [jpsecher](https://github.com/jpsecher)
+* Hardware Supported: https://github.com/jpsecher/keyboards/acacia
+
+Make example for this keyboard (after setting up your build environment):
+
+    make handwired/acacia:default
+
+Flashing example for this keyboard:
+
+    make handwired/acacia: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.
+
+## Bootloader
+
+Enter the bootloader by using the small buttons on the PCB: press the RESET button while connected to QMK Toolbox.
+
+Then you can flash the HEX file you built above.