Update README.md

Author: facutuesca

README.md

@@ -178,6 +178,24 @@ pypi-attestations convert --output-file /tmp/rfc8785-0.1.2-py3-none-any.whl.publ
 ```
 
 
+## License
+```
+Copyright 2024 Trail of Bits
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+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.
+```
+
+
 [PEP 740]: https://peps.python.org/pep-0740/
 
 [here]: https://trailofbits.github.io/pypi-attestations