Make mu-plugin for Composer and add instructions.

README.md

@@ -4,7 +4,13 @@ This must-use plugin adds page cache purging functionality to your WordPress sit
 
 ## Install
 
-Copy the contents of the `src` directory to `/wp-content/mu-plugins`, giving a directory structure like so:
+You can install the mu-plugin with Composer:
+
+```bash
+composer require deliciousbrains/spinupwp-mu-plugin
+```
+
+Or manually by downloading the zip and then copying the contents of the `src` directory to `/wp-content/mu-plugins`, giving a directory structure like so:
 
 ```
 ├── wp-content
@@ -15,7 +21,7 @@ Copy the contents of the `src` directory to `/wp-content/mu-plugins`, giving a d
     └── themes
 ```
 
-Add the following constants to your `wp-config.php`:
+Finally add the following constants to your `wp-config.php`:
 
 ```
 define( 'WP_CACHE_KEY_SALT', '{DOMAIN}' );

composer.json

@@ -1,11 +1,16 @@
 {
-    "name": "deliciousbrains/spinupwp-mu-plugin",
-    "description": "WordPress must-use plugin for sites hosted with SpinupWP",
-    "license": "GPLv2",
-    "authors": [
-        {
-            "name": "Delicious Brains",
-            "email": "[email protected]"
-        }
-    ]
+  "name": "deliciousbrains/spinupwp-mu-plugin",
+  "description": "WordPress must-use plugin for sites hosted with SpinupWP",
+  "license": "GPLv2",
+  "authors": [
+    {
+      "name": "Delicious Brains",
+      "email": "[email protected]"
+    }
+  ],
+  "type": "wordpress-muplugin",
+  "require": {
+    "composer/installers": "~1.0",
+    "lkwdwrd/wp-muplugin-loader": "~1.0.0"
+  }
 }