Added a dashboard widget

I've added a dashboard widget, the only thing I need now is a free API
that takes screenshot of the website
Update bootstrap.php
Update module.json
Update readme.md
Update readme.md
Update readme.md
Update dashboard.php
Update bootstrap.php
Update dashboard.php
Update readme.md
Update readme.md
Update readme.md
Update dashboard.php
Update readme.md
Update dashboard.php
Update dashboard.php
Update readme.md
Update dashboard.php
Merge pull request #2 from AC10/master

Big Update - Thanks AC10 !