希望加入字数统计功能

[chloe5685]

新写了一条memo，写了挺多的，本来想看一下写了多少字，发现没有统计字数的显示，希望能添加这个功能。

[Issues-translate-bot]

Issue is not in English. It has been translated automatically.

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Title: Hope to add word count function

I wrote a new memo, and I wrote a lot. I originally wanted to see how many words were written, but I found that there is no display of word count statistics. I hope this function can be added.