[Keyboard] add rocketkeyboards mercury65 (#20811)

Co-authored-by: jack <0x6a73@protonmail.com>

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+# Mercury65
+
+![Mercury65](https://i.imgur.com/rjfARj3h.jpeg)
+
+*65% Form Factor with a Separated Arrow Cluster used for Mercury65*
+
+
+* Keyboard Maintainer: [Drewkeys](https://github.com/drewpyun)
+* Hardware Supported: Made specifically for Mercury65, 65% hotswap supported
+* Hardware Availability: https://www.rocketkeyboards.com/collections/mercury65/products/gb-mercury65-keyboard
+
+Make example for this keyboard (after setting up your build environment):
+
+    make drewkeys/mercury65:default
+
+Flashing example for this keyboard:
+
+    make drewkeys/mercury65:default:flash
+## Bootloader
+
+Resetting Board: Press the button on the PCB next to the spacebar to soft reset the board to reflash (bootloader mode).
+
+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).