Add Contributing file

CONTRIBUTING.md

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+# Contribution Guidelines
+
+Thank you for your interest in Verifiable Credentials!
+
+This project welcomes contributions and suggestions. Most contributions require you to
+agree to a Contributor License Agreement (CLA) declaring that you have the right to,
+and actually do, grant us the rights to use your contribution.
+
+For details, visit https://cla.microsoft.com.
+
+When you submit a pull request, a CLA-bot will automatically determine whether you need
+to provide a CLA and decorate the PR appropriately (e.g., label, comment). Simply follow the
+instructions provided by the bot. You will only need to do this once across all repositories using our CLA.
+
+This project has adopted the Microsoft Open Source Code of Conduct.
+For more information see the Code of Conduct FAQ
+or contact opencode@microsoft.com with any additional questions or comments.
+
+Contributions come in many forms: submitting issues, writing code, participating in discussions and community calls.
+
+This document provides the guidelines for how to contribute to the Verifiable Credentials Wallet SDK project.
+
+## Issues
+
+This section describes the guidelines for submitting issues
+
+### Issue Types
+
+There are 4 types of issues:
+
+- Issue/Bug: You've found a bug with the code, and want to report it, or create an issue to track the bug.
+- Issue/Discussion: You have something on your mind, which requires input form others in a discussion, before it eventually manifests as a proposal.
+- Issue/Proposal: Used for items that propose a new idea or functionality. This allows feedback from others before code is written.
+- Issue/Question: Use this issue type, if you need help or have a question.
+
+### Before You File
+
+Before you file an issue, make sure you've checked the following:
+
+1. Is it the right repository?
+    - The Verifiable Credentials project is distributed across multiple repositories. Check out the [Android SDK](https://github.com/microsoft/VerifiableCredential-SDK-Android) or the [Verifier SDK](https://github.com/microsoft/VerifiableCredentials-Verification-SDK-Typescript)
+2. Check for existing issues
+    - Before you create a new issue, please do a search in [open issues](https://github.com/microsoft/VerifiableCredential-SDK-iOS/issues) to see if the issue or feature request has already been filed.
+    - If you find your issue already exists, make relevant comments and add your [reaction](https://github.com/blog/2119-add-reaction-to-pull-requests-issues-and-comments). Use a reaction:
+        - 👍 up-vote
+        - 👎 down-vote
+
+## Contributing to Verifiable Credentials
+
+This section describes the guidelines for contributing code / docs to the Verifiable Credentials SDK.
+
+### Pull Requests
+
+All contributions come through pull requests. To submit a proposed change, we recommend following this workflow:
+
+1. Make sure there's an issue (bug or proposal) raised, which sets the expectations for the contribution you are about to make.
+1. Fork the relevant repo and create a new branch
+1. Create your change
+    - Code changes require tests
+1. Update relevant documentation for the change
+1. Commit and open a PR
+1. Wait for the CI process to finish and make sure all checks are green
+1. A maintainer of the project will be assigned, and you can expect a review within a few days
+
+#### Use work-in-progress PRs for early feedback
+
+A good way to communicate before investing too much time is to create a "Work-in-progress" PR and share it with your reviewers. The standard way of doing this is to add a "[WIP]" prefix in your PR's title and assign the **do-not-merge** label. This will let people looking at your PR know that it is not well baked yet.
+
+### Use of Third-party code
+
+- Third-party code must include licenses.
+
+**Thank You!** - Your contributions to open source, large or small, make projects like this possible. Thank you for taking the time to contribute.
+
+## Code of Conduct
+
+This project has adopted the [Microsoft Open Source Code of Conduct](https://opensource.microsoft.com/codeofconduct/).