Add contributing instructions

README.md

@@ -35,6 +35,7 @@
   - [Built With](#built-with)
   - [Features](#features)
 - [Installation](#installation)
+- [Contributing](#contributing)
 - [License](#license)
 - [Roadmap](#roadmap)
 - [Contact](#contact)
@@ -157,6 +158,31 @@ Once done you will be taken to the login page.
 
 Go through the settings page once and change relevant settings before you start adding vehicles and expenses.
 
+## Contributing
+
+### Dev Setup
+
+If you want to contribute to the project you need to set it up
+for development first.
+
+Fork and clone the project. Once you have it on your own machine,
+open up a terminal and navigate to the `server/` directory.
+
+In the `server/` directory run the command `go run main.go`.
+After some initial
+setup, the server should be listening on at port `3000`.
+
+Next, open a new terminal. Navigate to the `ui/` directory and run `npm install`.
+This will install all the dependencies for the frontend.
+After the command is done running, run `npm run dev`. After some output, the
+frontend should be accessible at `http://localhost:8080`.
+
+If you are sent straight to the login screen, try closing the page and opening
+it again. You should be greeted with a setup wizard the first time you run the
+project.
+
+Now, simply follow the instructions in order to set up your fresh install.
+
 ## License
 
 Distributed under the GPL-3.0 License. See `LICENSE` for more information.