Update README.md

README.md

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 # javascript-snow
-Simply add snow on your website
+Simply add snow on your website. No dependencies, pure JavaScript.
+
+## How to use
+Simply copy `src/snow.min.js` file to, for example your website root folder and put this line into `<header>` block or at the end of page, but before `</body>` tag. Library will be loaded automatically and snow will start run too.
+```
+<script type="text/javascript" src="/snow.min.js"></script>
+```