Added License.txt

Summary:
Fixes T3
Signed-off-by: Gnanakeethan Balasubramaniam <gnanakeethan@gmail.com>

Test Plan: Test Plan Passed

Maniphest Tasks: T3

Differential Revision: http://phabricator.sys.lk/D1
Update:

Edited codeception.yml to use coverage generation

Signed-off-by: Gnanakeethan Balasubramaniam <gnanakeethan@gmail.com>
Merge branch 'develop'