Setting up Rollow definition in my userspace

- I know I can't build a firmware with the files here but I rather keep
them here over maintaining a qmk_firmware fork or creating a new repo
- Added the basic keyboard definition files
- Copied the Readme template from the website which is based on planck
- started populating info.json, taking inspiration from swoop/crkbd
- decided to omit the rev1 folder for now to simplify things

keyboards/barbellboards/rollow/info.json

@@ -0,0 +1,19 @@
+{
+	"keyboard_name": "Rollow",
+	"manufacturer": "BarbellBoards",
+	"url": "https://www.barbellboards.com/product/rollow",
+	"maintainer": "t4corun",
+	"usb": {
+		"pid": "0x5257",
+		"vid": "0x4242",
+		"device_version": "1.0.0"
+	},
+    "matrix_pins": {
+        "cols": [ "F4", "F5", "F6", "F7", "B1", "B3" ],
+        "rows": [ "D4", "C6", "D7", "E6" ]
+    },
+	"diode_direction": "COL2ROW",
+    "split": {
+        "enabled": true
+    },		
+}

keyboards/barbellboards/rollow/readme.md

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+# Rollow
+
+![Rollow](https://assets.bigcartel.com/product_images/327532800/BothBoards_Logo.png?auto=format&fit=max&h=500&w=500)
+
+Author's Note: Converting my ZMK Rollow to QMK, I decided to port/modernize Barry's Rollow keyboard definition. Setting up a new definition here as his github account shows no activity since mid 2022. Ultimately, this is a fun exercise for me to better understand how to setup a new keyboard especially under the new standards. I take no credit for Barry's awesome hardware design.
+
+A compact 40% (12x4) ortholinear keyboard kit made and sold by OLKB and Massdrop. [More info on qmk.fm](https://qmk.fm/planck/)
+
+* Keyboard Maintainer: [Jack Humbert](https://github.com/jackhumbert)
+* Hardware Supported: Planck PCB rev1, rev2, rev3, rev4, Teensy 2.0
+* Hardware Availability: [OLKB.com](https://olkb.com), [Massdrop](https://www.massdrop.com/buy/planck-mechanical-keyboard?mode=guest_open)
+
+Make example for this keyboard (after setting up your build environment):
+
+    make planck/rev4:default
+
+Flashing example for this keyboard:
+
+    make planck/rev4: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 3 ways:
+
+* **Bootmagic reset**: Hold down the key at (0,0) in the matrix (usually the top left key or Escape) and plug in the keyboard
+* **Physical reset button**: Briefly press the button on the back of the PCB - some may have pads you must short instead
+* **Keycode in layout**: Press the key mapped to `QK_BOOT` if it is available