README & sentry README - add contributing section

Author: elpiel

README.md

@@ -254,4 +254,11 @@ all the required services for the specific crate/application before executing th
 
 ### License
 
-This project is licensed under the [AGPL-3.0 license](./LICENSE)
+This project is licensed under the [AGPL-3.0 license](./LICENSE)
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in AdEx Validator by you, shall be licensed as AGPL-3.0, without any additional terms or conditions.
+
+#### Sign the CLA
+When you contribute to a AdEx Validator open source project on GitHub with a new pull request, a bot will evaluate whether you have signed the CLA. If required, the bot will comment on the pull request, including a link to this system to accept the agreement. 

sentry/README.md

@@ -6,7 +6,7 @@ For full details see [AIP #61](https://github.com/AmbireTech/aips/issues/61) and
 
 REST API documentation can be generated using `rustdoc`:
 
-`cargo doc --all-features --open --lib`
+`cargo doc --all-features --lib --no-deps --open`
 
 and checking the `sentry::routes` module.
 
@@ -33,4 +33,15 @@ and runs `wrk2` on the POST `/v5/campaign/0xXXXX../events` route for 3 campaigns
 
 ```bash
 cargo make run-benchmark
-```
+```
+
+### License
+
+This project is licensed under the [AGPL-3.0 license](./LICENSE)
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in AdEx Validator by you, shall be licensed as AGPL-3.0, without any additional terms or conditions.
+
+#### Sign the CLA
+When you contribute to a AdEx Validator open source project on GitHub with a new pull request, a bot will evaluate whether you have signed the CLA. If required, the bot will comment on the pull request, including a link to this system to accept the agreement.