docs: added recommended extensions to VSCode config

.vscode/extensions.json

@@ -0,0 +1,10 @@
+{
+	"recommendations": [
+		"bmewburn.vscode-intelephense-client",
+		"muuvmuuv.vscode-just-php-cs-fixer",
+		"getpsalm.psalm-vscode-plugin",
+		"esbenp.prettier-vscode",
+		"Vue.volar",
+		"Vue.vscode-typescript-vue-plugin"
+	]
+}

README.md

@@ -52,7 +52,7 @@ For automatic uploads, you can use the official Nextcloud mobile apps. These are
 1. 👩‍💻 In a terminal, run the command `make dev-setup` to install the dependencies.
 1. 🏗 To build/watch the UI, run `make watch-js`.
 1. ✅ Enable the app through the app management of your Nextcloud.
-1. ⚒️ (Strongly recommended) use VS Code for development and install these extensions.
+2. ⚒️ (Strongly recommended) use VS Code for development and install these extensions (`Ctrl+Shift+P` > `Show Recommended Extensions`).
    - [PHP Intelephense](https://marketplace.visualstudio.com/items?itemName=bmewburn.vscode-intelephense-client): For PHP intellisense and static analysis
    - [PHP-CS-Fixer](https://marketplace.visualstudio.com/items?itemName=muuvmuuv.vscode-just-php-cs-fixer): For PHP formatting (alternatively, `make php-cs-fixer`)
    - [Psalm](https://marketplace.visualstudio.com/items?itemName=getpsalm.psalm-vscode-plugin): For PHP static analysis (alternatively, `make psalm`)