Create CONTRIBUTING.md

Author: dysfunc

CONTRIBUTING.md

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+# CONTRIBUTING
+
+Contributions are always welcome, no matter how big or small the contribution. Before contributing, please read the [code of conduct](COC.md).
+
+## TLDR;
+
+```js
+> yarn
+> yarn dev
+```
+
+In another terminal window:
+
+```
+> yarn --cwd ./docs && yarn --cwd ./docs dev
+```
+
+## Getting Started
+
+1. Fork this repo to your personal GitHub account.
+
+1. Clone your personal fork
+
+   ```sh
+   > git clone [email protected]:<username>/viewable.git
+   ```
+
+1. Add upstream as a remote
+
+   ```sh
+   > git remote add upstream [email protected]:svelte-plugins/viewable.git
+   ```
+
+
+1. Install dependencies and watch for changes in source
+   
+   If you do not have yarn installed, run `npm i -g yarn`
+
+   ```sh
+   > yarn && yarn dev
+   ```
+
+1. Install dependencies and start the `docs` server
+
+   ```sh
+   > yarn --cwd ./docs && yarn --cwd ./docs dev
+   ```
+
+1. Open the following url http://localhost:3000. That's it!
+   
+## Pull Requests
+
+I welcome your pull requests.
+
+1. Fork the repo and create your branch from `main`.
+2. If you've added code that should be tested, add tests.
+3. If you've changed the API, update the documentation in the [README](README).
+4. Ensure the test suite passes.
+5. Make sure your code lints.
+
+## License
+
+By contributing to this repository, you agree that your contributions will be licensed
+under its [MIT](LICENSE) license.