Add README.md

Author: jasonwalsh

README.md

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+<div align="center">
+  <a href="https://github.com/mongodb-devprod-infrastructure/terraform-aws-networking-data-only">
+    <img src="https://user-images.githubusercontent.com/2184329/145092072-d669fd86-de77-427e-aa78-7bc14e0bf531.png" width="200">
+  </a>
+  <h1>
+    <code>terraform-aws-networking-data-only</code>
+  </h1>
+  <p>Returns descriptive information about an Amazon VPC</p>
+</div>
+
+<!-- BEGIN_TF_DOCS -->
+<!-- END_TF_DOCS -->
+
+## Contributing
+
+Please refer to the [CONTRIBUTING](docs/CONTRIBUTING.md) document for more information.
+
+## License
+
+[Apache License 2.0](LICENSE)