Jiajie/update ci

[jiajieey]

This PR fixes #1.

Summary

• As we are changing the proving backend and blockchain interaction, we should update ci checks.
• Because this repo is a fork, so i added a contribution.md to guide how to push a pr.

Changes

• Ignore integration test for both mock prover and real prover.
• Add contribution.md

Checklist

• Tests added/updated
• CI passes
• No secrets/keys committed
• Docs updated (if needed)
• Backwards compatible (or noted breaking change)

How to test

1. Testrunner will show there are only two tests for PR checks

Screenshots / Evidence (if applicable)

• nah

[AdarshRon]

LGTM