chore(dev): small readme fixes to devcontainer

.devcontainer/README.md

@@ -9,16 +9,18 @@ It works on Linux, Windows (WSL2) and OSX.
 - [VS code](https://code.visualstudio.com/download) installed
 - [VS code dev containers extension](https://marketplace.visualstudio.com/items?itemName=ms-vscode-remote.remote-containers) installed
 - [Docker](https://www.docker.com/products/docker-desktop) installed and running
+- [Docker Compose](https://docs.docker.com/compose/install/) installed
 
 ## Setup
 
 1. Create the following files and directory on your host if you don't have them:
 
     ```sh
     touch ~/.gitconfig ~/.zsh_history
+    mkdir -p ~/.ssh
     ```
 
-1. **For OSX hosts**: ensure your home directory `~` is accessible by Docker.
+1. **For OSX hosts**: ensure the project directory and your home directory `~` are accessible by Docker.
 1. Open the command palette in Visual Studio Code (CTRL+SHIFT+P).
 1. Select `Dev-Containers: Open Folder in Container...` and choose the project directory.