Add ji-chan.png to README.md

README.md

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 # <ruby lang="ja">字<rp>(</rp><rt>じ</rt><rp>)</rp></ruby>ちゃん
 
+<img src="ji-chan.png" width="192">
+
 </div>
 
+<br>
+
 <ruby lang="ja">字<rp>(</rp><rt>じ</rt><rp>)</rp></ruby>ちゃん is the Discord bot for the Tegaki Tuesday handwriting challenge. For more information on the challenge, please visit the [website](https://tegakituesday.com).
 
 She is written in Rust using the [serenity](https://github.com/serenity-rs/serenity) crate, and the overall structure of the codebase is based on [official example 6](https://github.com/serenity-rs/serenity/tree/current/examples/e06_sample_bot_structure). If you want to make a Discord bot using serenity, please refer to the official examples rather than this repository because I probably don't know what I'm doing.