Add 'group/' from commit 'ef56fabf7ba3ed990a7886836c855298c9c5eefa'

git-subtree-dir: group
git-subtree-mainline: af9f9c17ee
git-subtree-split: ef56fabf7b

group/COPYRIGHT

@@ -0,0 +1,14 @@
+Copyrights in the "group" library are retained by their contributors. No
+copyright assignment is required to contribute to the "group" library.
+
+The "group" library is licensed under either of
+
+ * Apache License, Version 2.0, (see ./LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license (see ./LICENSE-MIT or http://opensource.org/licenses/MIT)
+
+at your option.
+
+Unless you explicitly state otherwise, any contribution intentionally
+submitted for inclusion in the work by you, as defined in the Apache-2.0
+license, shall be dual licensed as above, without any additional terms or
+conditions.