[Keyboard] add cherryb studio cb1800 keyboard (#13639)

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

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+# CherryB Studio CB1800
+
+![cb1800](https://i.imgur.com/QRJ6DFsl.jpg)
+
+A G80-1800 inspired PCB for CB1800 Zakabato and any suitable 1800 layout keyboards.
+
+* Keyboard Maintainer: duongaanh
+* Hardware Supported: cb1800, atmega32u4
+* Hardware Availability: [CherryB Studio](https://www.reddit.com/r/mechmarket/comments/mneayy/ic_cb1800zanbato_1800_classic_by_cherryb/)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make cherrybstudio/cb1800:default
+
+Flashing example for this keyboard:
+
+    make cherrybstudio/cb1800:default:flash
+
+## Accessing Bootloader Mode
+
+To access Bootloader Mode, do one of the following:
+
+* Tap the Reset switch mounted on the top side of the PCB to the left of the spacebar
+* Hold the top left key of the keyboard while connecting the USB cable
+
+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).