Add kt356 Mini (#25781)

Co-authored-by: Joel Challis <git@zvecr.com>

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+# keyten kt356 Mini
+
+Replacement PCB for the OTD (and UTD) 356 Mini keyboard.
+
+![kt356 Mini image](https://live.staticflickr.com/65535/54907825962_65a650ce4c_b.jpg)
+
+* Keyboard Maintainer: [keyten](https://github.com/key10iq)
+* Hardware Supported: keyten kt356 Mini
+* Hardware Availability: private GB
+
+Make example for this keyboard (after setting up your build environment):
+
+    make keyten/kt356_mini:default
+        
+Flashing example for this keyboard:
+
+        make keyten/kt356_mini: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
+* Keycode in layout: Press the key mapped to `QK_BOOT` if it is available
+* Physical reset button: Hold the button on the back of the PCB