Add theme badge for hugo-coder (#513)
* Update README.md
Add theme budge for hugo-coder
* Update CONTRIBUTORS.md
Update contributors
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| | | - [Peter Duchnovsky](https://pduchnovsky.com) |
| | | - [Alex Miranda](https://ammiranda.com) |
| | | - [Alphonse Mariya](https://github.com/alfunx) |
| | | - [Ziwei Pan])(https://github.com/PanZiwei/) |
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| | | [](https://github.com/luizdepra/hugo-coder) |
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| | | A simple and clean blog theme for [Hugo](https://gohugo.io/). |