dev: update dev script for auto-download

README.md

@@ -16,6 +16,22 @@ BuildPath is made of four components:
 ### Getting started
 
 Developing BuildPath requires Docker for a local MongoDB instance, and a NodeJS/npm installation.
+Then, for the first-time setup:
+```bash
+# Install npm and node
+sudo apt install npm nodejs          # Ubuntu
+sudo pacman -S npm nodejs            # Arch
+sudo dnf install nodejs              # Fedora
+
+# Install docker. Follow instructions on
+# https://docs.docker.com/engine/install/
+# .. and don't forget docker compose
+
+cd dev && npm i && cd ..             # Install dependencies for the dev environment
+cd frontend && npm i && cd ..        # Install dependencies for frontend
+cd match_collector && npm i && cd .. # Install dependencies for match_collector
+cd patch_detector && npm i && cd ..  # Install dependencies for patch_detector
+```
 
 BuildPath needs data to work, either for generating statistics in the `match_collector` or for the frontend.