Update README.md

Author: alesanchezr

README.md

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 Complete selection of autograded html exercises, anyone interested in learning HTML!
 
 Hi! I'm [Alejandro Sanchez @alesanchezr](https://github.com/alesanchezr), really excited to have you here! 🎉 😂 Learning to code is hard, you need coaching! [DM me on twitter](https://twitter.com/alesanchezr) if you have any question. You'll be learning the following concepts:
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 1. Get familiar with most of the most popular HTML Tags.
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 4. The HTML audio and video tag.
 
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 #### Before we start... other related tutorials
 
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