Add Jianovka photo.

Dependencies

• [2] T3DMCYVW Add README

Change contents

• replacement in README.md at line 5
  [2.302]→[2.302:458](∅→∅)
  − This keyboard is designed to be made with Hall effect switches and keys from vintage Zbrojovka 262.3 keyboard, Teensy 2.0 microcontroller and QMK firmware.
  [2.302]

  [2.458]
  + ![Jianovka keyboard](https://klava.wiki/binary/%D0%BA%D0%BB%D0%B0%D0%B2%D0%B8%D0%B0%D1%82%D1%83%D1%80%D1%8B/jianovka)This keyboard is designed to be made with Hall effect switches and keys from vintage Zbrojovka 262.3 keyboard, Teensy 2.0 microcontroller and QMK firmware.