Add Common Tasks cover page, Browsing the Web doc and media.

content/en/common-tasks.md

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+# Common Tasks
+*Solus aims to make the everyday experience of computing easier.*
+
+*We provide numerous applications out of the box to make your experience seamless.*
+
+<!-- Reference common-tasks/* contents. -->

content/en/common-tasks/browsing-the-web.md

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+## Browsing the web
+
+![Firefox image](../../images/common-tasks/browsing-the-web.png)
+
+Solus comes pre-installed with Firefox, a secure and trustworthy web browser provided by the non-profit organization [Mozilla](https://www.mozilla.org/en-US/).