readme: add homebrew install guideline

README.md

@@ -4,15 +4,34 @@ Radiator is the 100% open source podcast hosting project for the next century of
 
 [![Test](https://github.com/podlove/radiator/actions/workflows/test.yml/badge.svg)](https://github.com/podlove/radiator/actions/workflows/test.yml) [![Contributor Covenant](https://img.shields.io/badge/Contributor%20Covenant-2.1-4baaaa.svg)](CODE_OF_CONDUCT.md)
 
-To start your Phoenix server:
-
-- Run `mix setup` to install and setup dependencies
-- Start Phoenix endpoint with `mix phx.server` or inside IEx with `iex -S mix phx.server`
-
-Now you can visit [`localhost:4000`](http://localhost:4000) from your browser.
-
 ## Contributing
 
 The Radiator team welcomes contributions from anyone who wishes to advance the development of the Radiator!
 
 If you'd like to contribute, please note we have [contribution docs](CONTRIBUTING.md) and a [code of conduct](CODE_OF_CONDUCT.md). Please follow it in all your interactions with the people and the project.
+
+## Setup
+
+### Using Homebrew
+
+Open a Terminal and run the following commands
+
+#### Install Homebrew
+
+- `/bin/bash -c "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/HEAD/install.sh)"`
+
+#### Install & Start Postgres
+
+- `brew install postgresql`
+- `brew services start postgresql`
+- `createuser -d postgres`
+
+#### Install Elixir
+
+- `brew install elixir`
+
+#### Setup and Start Radiator
+
+- Run `mix setup` to install and setup dependencies
+- Start Radiator with `mix phx.server`
+- Visit [`localhost:4000`](http://localhost:4000) from your browser