chore: add CONTRIBUTING.md

CONTRIBUTING.md

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+# Contribution guidelines
+
+First off, thank you for considering contributing to Ducker.
+
+If your contribution is not straightforward, please first discuss the change you wish to make by
+creating a new issue before making the change.
+
+## Reporting issues
+
+Before reporting an issue on the [issue tracker](https://github.com/robertpsoane/ducker/issues),
+please check that it has not already been reported by searching for some related keywords.
+
+## Pull requests
+
+Try to do one pull request per change.
+
+## Commit Message Format
+
+This project adheres to [Conventional Commits](https://www.conventionalcommits.org/en/v1.0.0/).
+A specification for adding human and machine readable meaning to commit messages.
+
+### Commit Message Header
+
+```plain
+<type>(<scope>): <short summary>
+  │       │             │
+  │       │             └─⫸ Summary in present tense. Not capitalized. No period at the end.
+  │       │
+  │       └─⫸ Commit Scope
+  │
+  └─⫸ Commit Type: feat|fix|build|ci|docs|perf|refactor|test|chore
+```
+
+#### Type
+
+| feat                                                | Features                 | A new feature                                                                               |
+| --------------------------------------------------- | ------------------------ | ------------------------------------------------------------------------------------------- |
+| fix                                                 | Bug Fixes                | A bug fix                                                                                   |
+| docs                                                | Documentation            | Documentation only changes                                                                  |
+| style                                               | Styles                   | Changes that do not affect the meaning of the code\                                         |
+| (white-space, formatting, missing semi-colons, etc) |
+| refactor                                            | Code Refactoring         | A code change that neither fixes a bug nor adds a feature                                   |
+| perf                                                | Performance Improvements | A code change that improves performance                                                     |
+| test                                                | Tests                    | Adding missing tests or correcting existing tests                                           |
+| build                                               | Builds                   | Changes that affect the build system or external dependencies (example scopes: main, serde) |
+| ci                                                  | Continuous Integrations  | Changes to our CI configuration files and scripts (example scopes: Github Actions)          |
+| chore                                               | Chores                   | Other changes that don't modify src or test files                                           |
+| revert                                              | Reverts                  | Reverts a previous commit                                                                   |
+
+## Developing
+
+### Set up
+
+
+```shell
+git clone https://github.com/robertpsoane/ducker
+cd ducker
+```
+
+### Useful Commands
+
+- Run Clippy:
+
+  ```shell
+  cargo clippy --all-targets --all-features --workspace
+  ```
+
+
+- Check to see if there are code formatting issues
+
+  ```shell
+  cargo fmt --all -- --check
+  ```
+
+- Format the code in the project
+
+  ```shell
+  cargo fmt --all
+  ```
+
+(based on [joshka/ratatui-widgets/CONTRIBUTING.md](https://github.com/joshka/ratatui-widgets/tree/main))