Merge pull request #1 from ka1iht/ka1iht-patch-1

Create metallica.md

Author: ka1iht

english/metallica/metallica.md

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+Metallica Wiki? [here](https://en.wikipedia.org/wiki/Metallica)
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+The Metallica website [here](https://www.metallica.com/)
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+Metallica Twitter [here](https://twitter.com/Metallica)
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+Metallica YouTube Channel [here](https://www.youtube.com/user/MetallicaTV)
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