fix: add assets:install to install instructions

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -17,14 +17,28 @@ A GitHub-style activity heatmap for your [Kimai](https://www.kimai.org/) dashboa
 
 ## Installation
 
-Copy the plugin into your Kimai `var/plugins/` directory:
-
 ```bash
-cd /path/to/kimai
+composer config repositories.heatmap vcs https://git.toph.so/toph/kimai-plugin-heatmap
-git clone https://github.com/toph/kimai-heatmap.git var/plugins/KimaiHeatmapBundle
+composer require kimai-plugin/heatmap-bundle
+bin/console assets:install
 bin/console kimai:reload
 ```
 
+If you can't run `composer require` directly (e.g. Docker Compose, Nomad, or a custom image), add this to your `composer.json` instead:
+
+```json
+{
+    "repositories": [
+        { "type": "vcs", "url": "https://git.toph.so/toph/kimai-plugin-heatmap" }
+    ],
+    "require": {
+        "kimai-plugin/heatmap-bundle": "^1.0"
+    }
+}
+```
+
+Then rebuild your image or run `composer install` in the container.
+
 ## Development
 
 Requires [Nix](https://nixos.org/):