Add Autotext Tester

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Update documentation about autotexttest command

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Update Changelog.txt

Signed-off-by: Sup Yut Sum <ch3cooli@gmail.com>
Merge branch 'autotext'