Add 'sapling-crypto/' from commit '21084bde2019c04bd34208e63c3560fe2c02fb0e'

git-subtree-dir: sapling-crypto
git-subtree-mainline: 9f748554d0
git-subtree-split: 21084bde20

sapling-crypto/COPYRIGHT

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+Copyrights in the "sapling-crypto" library are retained by their contributors. No
+copyright assignment is required to contribute to the "sapling-crypto" library.
+
+The "sapling-crypto" 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.