feat: contribution guide

CONTRIBUTING.md

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+# Welcome to the Arena contributing guide <!-- omit in toc -->
+
+Thank you for investing your time in contributing to our project! Any contribution you make is greatly appreciated :sparkles:. 
+
+In this guide you will get an overview of the contribution workflow from opening an issue, creating a PR, reviewing, and merging the PR.
+
+Use the table of contents icon on the top left corner of this document to get to a specific section of this guide quickly.
+
+## New contributor guide
+
+To get an overview of the project, read the [README](https://github.com/arena-rs/arena/blob/main/README.md). Here are some resources to help you get started with open source contributions:
+
+- [Finding ways to contribute to open source on GitHub](https://docs.github.com/en/get-started/exploring-projects-on-github/finding-ways-to-contribute-to-open-source-on-github)
+- [Set up Git](https://docs.github.com/en/get-started/quickstart/set-up-git)
+- [GitHub flow](https://docs.github.com/en/get-started/quickstart/github-flow)
+- [Collaborating with pull requests](https://docs.github.com/en/github/collaborating-with-pull-requests)
+
+## Getting started
+
+### Issues
+
+#### Create a new issue
+
+If you spot a problem with the docs, [search if an issue already exists](https://docs.github.com/en/github/searching-for-information-on-github/searching-on-github/searching-issues-and-pull-requests#search-by-the-title-body-or-comments). If a related issue doesn't exist, you can open a new issue!
+
+#### Solve an issue
+
+Scan through our [existing issues](https://github.com/primitivefinance/arbiter/issues) to find one that interests you. You can narrow down the search using `labels` as filters. If you find an issue to work on, you are welcome to assign it to yourself and open a PR with a fix.
+
+### Make Changes
+
+1. [Install Git LFS](https://docs.github.com/en/github/managing-large-files/versioning-large-files/installing-git-large-file-storage).
+2. Fork the repository.
+- Using GitHub Desktop:
+  - [Getting started with GitHub Desktop](https://docs.github.com/en/desktop/installing-and-configuring-github-desktop/getting-started-with-github-desktop) will guide you through setting up Desktop.
+  - Once Desktop is set up, you can use it to [fork the repo](https://docs.github.com/en/desktop/contributing-and-collaborating-using-github-desktop/cloning-and-forking-repositories-from-github-desktop)!
+
+- Using the command line:
+  - [Fork the repo](https://docs.github.com/en/github/getting-started-with-github/fork-a-repo#fork-an-example-repository) so that you can make your changes without affecting the original project until you're ready to merge them.
+
+3. Create a working branch and start with your changes!
+
+### Commit your update
+
+Commit the changes once you are happy with them with descriptive comments:zap:.
+
+### Pull Request
+
+When you're finished with the changes, create a pull request, also known as a PR.
+- Check to see your pull request passes our continuous integration (CI). If you cannot get a certain integration test to pass, let us know. We can assist you in fixing these issues or approve a merge manually.
+- Make sure your additions are properly documented! You can see the [Rust book](https://doc.rust-lang.org/rustdoc/how-to-write-documentation.html) for documentation guidelines. Each module uses the diagnostic attribute `#![warn(missing_docs)]` which will trigger clippy in our CI.
+- Don't forget to [link PR to issue](https://docs.github.com/en/issues/tracking-your-work-with-issues/linking-a-pull-request-to-an-issue) if you are solving one.
+- Enable the checkbox to [allow maintainer edits](https://docs.github.com/en/github/collaborating-with-issues-and-pull-requests/allowing-changes-to-a-pull-request-branch-created-from-a-fork) so the branch can be updated for a merge.
+Once you submit your PR, a Arbiter team member will review your proposal. We may ask questions or request additional information.
+- We may ask for changes to be made before a PR can be merged, either using [suggested changes](https://docs.github.com/en/github/collaborating-with-issues-and-pull-requests/incorporating-feedback-in-your-pull-request) or pull request comments. You can apply suggested changes directly through the UI. You can make any other changes in your fork, then commit them to your branch.
+- As you update your PR and apply changes, mark each conversation as [resolved](https://docs.github.com/en/github/collaborating-with-issues-and-pull-requests/commenting-on-a-pull-request#resolving-conversations).
+- If you run into any merge issues, checkout this [git tutorial](https://github.com/skills/resolve-merge-conflicts) to help you resolve merge conflicts and other issues.
+
+### Your PR is merged!
+
+Congratulations :tada::tada: The Arena team thanks you :sparkles:. 
+
+Once your PR is merged, your contributions will be publicly visible on the [Arena Repository](https://github.com/arena-rs/arena).
+
+*Forked from [Arbiter contribution guide](https://github.com/primitivefinance/arbiter/blob/main/.github/CONTRIBUTING.md)*