Adding three popular Atlassian products

Many more of their products are available as oss perks. Picking three
popular ones. The JIRA entry pushes the description too far right
because of no line breaks for the platform tags.
Adding Kendo UI
Merge pull request #2 from DonKarlssonSan/gh-pages

Kendo UI, JIRA, Confluence, Bitbucket OnDemand