add basic contributing guide

CONTRIBUTING.md

@@ -0,0 +1,27 @@
+# Contributing
+
+Thank you for your interest in contributing to StartStack! It means so much.
+Before you start, please check for open issues and pull requests to ensure your work is not already being addressed.
+
+## How to get started
+
+### Clone the repository
+
+```bash
+git clone https://github.com/collinschaafsma/startstack.git
+cd startstack
+```
+
+### Create a new branch
+
+```bash
+git checkout -b my-new-feature
+```
+
+### Install dependencies
+
+```bash
+pnpm install
+```
+
+Before you submit a pull request, please read up on [commit conventions](https://www.conventionalcommits.org/en/v1.0.0/).