[Keyboard] Add bigsmoothknob (#21265)

Co-authored-by: Joel Challis <git@zvecr.com>
Co-authored-by: jack <0x6a73@protonmail.com>

keyboards/nacly/bigsmoothknob/readme.md

@@ -0,0 +1,22 @@
+# Big Smooth Knob
+8 key macro pad with a gigantic knob. 
+
+
+* Keyboard Maintainer: [na-cly](https://github.com/na-cly)  
+* Hardware Supported: Big Smooth Knob
+
+Make example for this keyboard (after setting up your build environment):
+
+    make nacly/bigsmoothknob:default
+
+Flashing example for this keyboard:
+
+    make nacly/bigsmoothknob: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:
+
+* **boot button**: Hold the BOOT button on the back of the PCB while plug in usb cable