Add CONTRIBUTING.md

CONTRIBUTING.md

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+<!--
+SPDX-FileCopyrightText: 2024 The IREE bare-metal Arm Authors
+SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+-->
+# How to contribute
+
+We'd love to accept your patches and contributions to this project.
+
+To get started with contributing, please take a look at the
+[Contributing](https://iree.dev/developers/general/contributing/) guide.
+
+## Getting in touch
+
+*   [GitHub issues](https://github.com/iree-org/iree-bare-metal-arm/issues): Feature requests,
+    bugs, and other work tracking
+*   [IREE Discord server](https://discord.gg/wEWh6Z9nMU): Daily development
+    discussions with the core team and collaborators
+*   [iree-discuss email list](https://groups.google.com/forum/#!forum/iree-discuss):
+    Announcements, general and low-priority discussion
+
+## Community guidelines
+
+This project follows the
+[LF Projects code of conduct](https://lfprojects.org/policies/code-of-conduct/).