Added material design tutorial (#2243)

* Added material design tutorial * Update free-courses-en.md

Added material design tutorial (#2243)
* Added material design tutorial * Update free-courses-en.md
ffb0e853 · Liza :) · victor felder · 0aeb2c6d · ffb0e853
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free-courses-en.md free-courses-en.md +1 -0

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 ### Android

 * [Creative, Serious and Playful Science of Android Apps](https://www.coursera.org/course/androidapps101/)
+* [Material design](https://material.io/guidelines/)
 * [Programming Cloud Services for Android Handheld Systems](https://www.coursera.org/course/mobilecloudprogram)
 * [Programming Mobile Applications for Android Handheld Systems pt. 1](https://www.coursera.org/course/android)
 * [Programming Mobile Applications for Android Handheld Systems pt. 2](https://www.coursera.org/course/androidpart2)