Add initial project contribution standards

CONTRIBUTING.md

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+# Contributing to AgIsoStack-rs
+
+We warmly welcome you to AgIsoStack-rs!
+
+Contributing to our open source repository implementing the ISOBUS (ISO11783) standard in the
+agricultural industry can involve anything from adding new features, improving existing code, fixing
+bugs, or even just helping to test and document the project. We greatly appreciate any contributions
+you can make to help drive progress and innovation in this field. Thank you for your interest and
+support!
+
+We accept all public contributions that adhere to the [code of
+conduct](https://github.com/Open-Agriculture/AgIsoStack-plus-plus/blob/main/CODE_OF_CONDUCT.md)
+defined by our sibling project
+[AgIsoStack++](https://github.com/Open-Agriculture/AgIsoStack-plus-plus). Additionally, for PR's we
+require the pass of all automated pre-merge checks, and a manual code review by a repository
+maintainer to ensure that our high code quality and project standards are maintained.
+
+## What are our guidelines?
+
+* Contributions must follow the usual `rustc` and `clippy` lints, and the default `rustfmt`
+  settings. Exceptions to lints are allowed, but should be defined in the project's `lib.rs` file
+
+  You can check these settings with `cargo check`, `cargo clippy`, and `cargo fmt`
+* The code should compile with no warnings in the CI pipeline using `RUSTFLAGS=-Dwarnings`
+* `rustdoc` documentation should compile without warnings in the CI pipeline using
+  `RUSTDOCFLAGS=-Dwarnings`
+* No code should be added under a more strict license than MIT, or which has not had conditions met
+  to be distributed under our license
+* There must be a copyright notice in every source file
+* Contributions must pass the CI pipeline
+* Aim for ~80% code coverage on new code, but prioritize high quality tests over gaming code
+  coverage percentages
+
+## Minimum supported Rust version
+
+**TODO:** Define a MSRV
+
+## Setting up a development environment
+
+## Copyright
+
+AgIsoStack-rs is sponsored by Raven Industries inc. as an open source project under the MIT license
+started during an Innovation Sprint under the condition that Raven maintains copyright over the
+project, including future contributions. See the [COPYRIGHT](./COPYRIGHT) file for details.
+
+In addition to the `COPYRIGHT` file, every source file should include the following copyright notice
+
+```rust
+// Copyright 2023 Raven Industries, inc.
+```