Add a Contributing section to README.

README.md

@@ -55,3 +55,20 @@ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 See the License for the specific language governing permissions and
 limitations under the License.
 ```
+
+
+## Contributing
+
+```
+By submitting a contribution (the “Contribution”) to this project,
+and for good and valuable consideration, the receipt and sufficiency of which
+are hereby acknowledged, you (the “Assignor”) irrevocably convey, transfer,
+and assign the Contribution to the owner of the repository (the “Assignee”),
+and the Assignee hereby accepts, all of your right, title, and interest in and
+to the Contribution along with all associated copyrights, copyright
+registrations, and/or applications for registration and all issuances,
+extensions and renewals thereof (collectively, the “Assigned Copyrights”).
+You also assign all of your rights of any kind whatsoever accruing under
+the Assigned Copyrights provided by applicable law of any jurisdiction,
+by international treaties and conventions and otherwise throughout the world.
+```