Add LICENSE to third_party/vulcan

NoTry: true
Bug: skia:8217
Change-Id: I74212c3868b57cc002389277213d16ceb7604d60
Reviewed-on: https://skia-review.googlesource.com/144906
Reviewed-by: Ravi Mistry <rmistry@google.com>
Commit-Queue: Ravi Mistry <rmistry@google.com>
1 file changed