Add missing license file for caffeine. Bugzilla Id: 59934
Add missing license file for caffeine. Bugzilla Id: 59934

git-svn-id: https://svn.apache.org/repos/asf/jmeter/trunk@1771619 13f79535-47bb-0310-9956-ffa450edef68

Former-commit-id: 97536f2eebd956c0a4215046c1a49058e59dee25
benbenw/jmeter,etnetera/jmeter,apache/jmeter,ham1/jmeter,ham1/jmeter,apache/jmeter,benbenw/jmeter,ham1/jmeter,benbenw/jmeter,etnetera/jmeter,benbenw/jmeter,apache/jmeter,ham1/jmeter,etnetera/jmeter,apache/jmeter,etnetera/jmeter,etnetera/jmeter,ham1/jmeter,apache/jmeter