Update README with SSO Behavior (#157)

# Update README with SSO Behavior

## ⚙️ Release Notes 
- Update README with SSO Behavior

### Code of Conduct & Contributing Guidelines 

By submitting creating this pull request, you agree to follow our [Code
of
Conduct](https://github.com/StanfordBDHG/.github/blob/main/CODE_OF_CONDUCT.md)
and [Contributing
Guidelines](https://github.com/StanfordBDHG/.github/blob/main/CONTRIBUTING.md):
- [x] I agree to follow the [Code of
Conduct](https://github.com/StanfordBDHG/.github/blob/main/CODE_OF_CONDUCT.md)
and [Contributing
Guidelines](https://github.com/StanfordBDHG/.github/blob/main/CONTRIBUTING.md).

CONTRIBUTORS.md

@@ -0,0 +1,14 @@
+<!--
+
+This source file is part of the Stanford Biodesign Digital Health ENGAGE-HF open-source project
+
+SPDX-FileCopyrightText: 2023 Stanford University and the project authors (see CONTRIBUTORS.md)
+
+SPDX-License-Identifier: MIT
+
+-->
+
+# Stanford Biodesign Digital Health ENGAGE-HF open-source project
+
+- [Paul Johannes Kraft](https://github.com/pauljohanneskraft)
+- [Paul Schmiedmayer](https://github.com/PSchmiedmayer)