Add copy of opus library in deps/third_party.

TBR=dannyb@google.com
Review URL: https://codereview.chromium.org/11196031

git-svn-id: svn://svn.chromium.org/chrome/trunk/deps/third_party/opus@162558 0039d316-1c4b-4281-b951-d872f2087c98
diff --git a/AUTHORS b/AUTHORS
new file mode 100644
index 0000000..b3d22a2
--- /dev/null
+++ b/AUTHORS
@@ -0,0 +1,6 @@
+Jean-Marc Valin (jmvalin@jmvalin.ca)
+Koen Vos (koenvos74@gmail.com)
+Timothy Terriberry (tterribe@xiph.org)
+Karsten Vandborg Sorensen (karsten.vandborg.sorensen@skype.net)
+Soren Skak Jensen (ssjensen@gn.com)
+Gregory Maxwell (greg@xiph.org)