chore(oss): scaffold contributions

Author: billf

CONTRIBUTING.md

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+# Contributing to the Project
+
+Thank you for your interest in contributing to wasm-component-trampoline.
+We welcome contributions from the community and appreciate your efforts to improve the codebase.
+
+## Pre-requisite Knowledge
+
+Before you start contributing, please ensure you have the following:
+1. A working knowledge of Rust and [WebAssembly](https://webassembly.org/) (or a willingness to learn).
+1. Familiarity with [Wasmtime](https://docs.wasmtime.dev/) as it relates to the [WebAssembly component model](https://component-model.bytecodealliance.org/).
+
+## How to Develop
+
+We use [devenv](https://devenv.sh/) to manage our development environment.
+
+1. **Clone the Repository**: You know how to do that.
+1. **Install direnv**: Follow the instructions at [direnv Installation](https://direnv.net/docs/installation.html) to install direnv.
+1. **Install Devenv**: Follow the instructions at [Devenv Installation](https://devenv.sh/docs/installation) to install devenv.
+1. `direnv allow $PWD` and/or `devenv shell` to enter the development environment.
+1. `devenv test` to run all the tests locally.
+1. (OPTIONAL) `devenv shell wasm-trampoline-coverage` to generate code coverage. `cargo llvm-cov  report --html --open --release` to view a coverage report in your browser.
+
+## License
+
+[License](LICENSE)
+
+## Contribution Agreement
+
+[Developer Certificate of Origin](https://developercertificate.org/)
+Version 1.1
+
+Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
+
+Everyone is permitted to copy and distribute verbatim copies of this
+license document, but changing it is not allowed.
+
+
+Developer's Certificate of Origin 1.1
+
+By making a contribution to this project, I certify that:
+
+(a) The contribution was created in whole or in part by me and I
+    have the right to submit it under the open source license
+    indicated in the file; or
+
+(b) The contribution is based upon previous work that, to the best
+    of my knowledge, is covered under an appropriate open source
+    license and I have the right under that license to submit that
+    work with modifications, whether created in whole or in part
+    by me, under the same open source license (unless I am
+    permitted to submit under a different license), as indicated
+    in the file; or
+
+(c) The contribution was provided directly to me by some other
+    person who certified (a), (b) or (c) and I have not modified
+    it.
+
+(d) I understand and agree that this project and the contribution
+    are public and that a record of the contribution (including all
+    personal information I submit with it, including my sign-off) is
+    maintained indefinitely and may be redistributed consistent with
+    this project or the open source license(s) involved.