Another easy solution is to use the flair feature that’s built into Stack Exchange:
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Edit your profile
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Click on “Flair” in the sidebar:
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Copy the HTML shown on that page and paste it into your
README.md
By default, flair images look like this:
There are options on the flair page for changing the theme as well as showing data from just one site (e.g. Stack Overflow) or including reputation from all Stack Exchange sites where you have over 200 points.