Add help to validate whether or not a contributor has signed an ECA.

Submitted by Wayne Beaton @wbeaton

Link to original bug (#532676)

Description

Provide some help for committers to find the ECA validation tool.

Something like this, but rephrase.

-- There is a tool in you Eclipse Account page to determine whether or not a contributor has signed an ECA.

https://accounts.eclipse.org/user/eca

The hooks that we put onto the Git/Gerrit/GitHub repositories check this sort of thing automatically, but if you ever need to have that information, you can get it manually.

Include a screenshot.