adjust metadata

README.md

@@ -8,3 +8,26 @@ Show images before/after comparison of your WordPress images.
 * Unzip and upload the plugin to the **/wp-content/plugins/** directory
 * Activate the plugin in WordPress
 * Use the editor button or **[compare before="id of image" after="id of image"]** to show comparison.
+
+# Installation with composer
+
+* Add the repo to your composer.json
+
+```json
+
+"repositories": [
+    {
+        "type": "vcs",
+        "url": "https://github.com/fafiebig/faf-compare.git"
+    }
+],
+
+```
+
+* require the package with composer
+
+```shell
+
+composer require fafiebig/faf-compare 1.*
+
+```