Create _index.md

add 2nd option how to contribute

content/contribute/_index.md

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+title = 'Lessons'
+featured_image = "/images/code-coffee-pic.jpeg"
+description = "Learning Materials"
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+
+We are happy you want to contribute to our lessons! On this page you will find details about how you can contribute with a lesson or with suggestions of changes and corrections to our content. Here you will also find the author guidelines for lesson contributions.