RFR: JDK-8179556 Add specs copyright file

[Magnus Ihse Bursie]

The new $module/specs specifications needs to point to a proper 
copyright file.

Bug: https://bugs.openjdk.java.net/browse/JDK-8179556
WebRev: 
http://cr.openjdk.java.net/~ihse/JDK-8179556-add-legal-copyright-html/webrev.01

/Magnus