Add licenses and contribution section in README

README.md

@@ -14,3 +14,20 @@ The repository is structured into the several crates.
 
 - `testcontainers` contains the actual library and trait definitions
 - The folder `images` contains several crates named after the respective docker image. Each crate adds support for one particular image. This allows to selectively import the images you need.
+
+## License
+
+Licensed under either of
+
+ * Apache License, Version 2.0
+   ([LICENSE-APACHE](LICENSE-Apache-2.0) or http://www.apache.org/licenses/LICENSE-2.0)
+ * MIT license
+   ([LICENSE-MIT](LICENSE-MIT) or http://opensource.org/licenses/MIT)
+
+at your option.
+
+## Contribution
+
+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.