[Feature] Add similar kanji

[furdzik]

• Add functionality ✔️
• Add to your list of kanji

[furdzik]

• Change functionality, one json file with similar kanji arrays ✔️

[
  [ '雲', '雪', '雷', '電', '需' ],
  ...
]

And then checking if selected one is in any of the lists and if is, then return whole set.

[furdzik]

#73