Update README.md

Added Credits and "How to install"

README.md

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-# Simple-Quiz-in-js
-Just a quiz in hp world
+
+# Simple Quiz In Js
+
+Here is a little quiz that I did in html/css/js.
+
+It's very simple to do that's why I'm giving you the source code.
+
+Forgive me for the horrible colors and presentation of the site, I did it very quickly without worrying about beauty!
+
+
+
+## Installation
+
+How install this quiz ?
+
+No need for a line of code to use it!
+
+Download it and open the "index.html" in your browser!
+
+
+## Authors
+
+- Me : [@avadakedavra6](https://github.com/AvadaKedavra6)
+- thanks to [this](https://readme.so) (readme generator)
+