update CONTRIBUTING.md

Author: danadajian

CONTRIBUTING.md

@@ -18,24 +18,29 @@ git checkout -b my-new-feature
 
 where "my-new-feature" describes what you're working on.
 
-### 3. Add tests for any bug fixes or new functionality
+### 3. Setup your environment
+
+This project uses [bun](https://bun.sh/), so you will need to [install it](https://bun.sh/docs/installation) to get started.
+Once installed, run `bun install` at the root of the project to install all dependencies.
+
+### 4. Add tests for any bug fixes or new functionality
 
 All functions must be tested with a unit test. Please follow the existing convention of one exported function per file with a corresponding file to test it. Run tests using `bun test`.
 
-### 4. Check code style
+### 5. Check code style
 
 Before opening a pull request, ensure that you have installed all dependencies so the pre-commit hooks will run.
 These hooks will run ESLint according to the [.eslintrc.json](./.eslintrc.json) and style the code according to the prettier defaults.
 
-### 5. Add documentation for new or updated functionality
+### 6. Add documentation for new or updated functionality
 
 Please review all the .md files in this project to see if they are impacted by your change and update them accordingly.
 
-### 6. Format Commits
+### 7. Format Commits
 
 This project uses [Semantic Release](https://github.com/semantic-release/semantic-release) for versioning. As such, commits need to follow the format: `<type>(<scope>): <short summary>`. All fields are required.
 
-### 7. Submit Pull Request and describe the change
+### 8. Submit Pull Request and describe the change
 
 Push your changes to your branch and open a pull request against the parent repo on GitHub. The project administrators will review your pull request and respond with feedback.