readme: Add contribution section
@@ -146,3 +146,9 @@ directory.
## License
Anchor is licensed under [Apache 2.0](./LICENSE).
+
+## Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in Anchor by you, as defined in the Apache-2.0 license, shall be
+licensed as above, without any additional terms or conditions.
