Add basic README and CONTRIBUTING files

CONTRIBUTING.md

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+# Contributing
+
+This project welcomes contributions for bug fixes, documentation updates, new
+features, or whatever you might like. Development is done through GitHub pull
+requests. Feel free to reach out on the [Bytecode Alliance
+Zulip](https://bytecodealliance.zulipchat.com/) as well if you'd like assistance
+in contributing or would just like to say hi.
+
+# License
+
+This project is licensed under the Apache 2.0 license with the LLVM exception.
+See [LICENSE](LICENSE) for more details.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in this project by you, as defined in the Apache-2.0 license,
+shall be licensed as above, without any additional terms or conditions.

README.md

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+<h1 align="center">wasm-pkg-tools</h1>
+<div align="center">
+
+  <strong>A <a href="https://bytecodealliance.org/">Bytecode Alliance</a> project</strong>
+
+  <p>
+    <strong>
+      Tools to package up <a href="https://github.com/webassembly/component-model">Wasm Components</a>
+    </strong>
+  </p>
+</div>
+
+## Contributing
+Want to join us? Check out our ["Contributing" guide][contributing] and take a
+look at some of these issues:
+
+- [Issues labeled "good first issue"][good-first-issue]
+- [Issues labeled "help wanted"][help-wanted]
+
+[contributing]: https://github.com/bytecodealliance/wasm-pkg-tools/blob/master.github/CONTRIBUTING.md
+[good-first-issue]: https://github.com/bytecodealliance/wasm-pkg-tools/labels/good%20first%20issue
+[help-wanted]: https://github.com/bytecodealliance/wasm-pkg-tools/labels/help%20wanted
+
+## License
+
+<sup>
+Licensed under <a href="LICENSE">Apache-2.0 WITH LLVM-exception</a> 
+</sup>
+
+<br/>
+
+<sub>
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in this crate by you, as defined in the Apache-2.0 license with LLVM-exception,
+shall be licensed as above, without any additional terms or conditions.
+</sub>