add livechat entry

git-svn-id: https://plugins.svn.wordpress.org/tidio-live-chat/trunk@910501 b8457f37-d9ea-0310-8a92-e5e31aec5664
update tags section

git-svn-id: https://plugins.svn.wordpress.org/tidio-live-chat/trunk@910504 b8457f37-d9ea-0310-8a92-e5e31aec5664