added composer support

Author: h7io

composer.json

@@ -0,0 +1,14 @@
+{
+	"name": "copperis/dropdownimagefield",
+	"description": "Dropdown field with image support for SilverStripe CMS",
+	"type": "silverstripe-module",
+	"keywords": ["silverstripe", "dropdown", "image"],
+	"license": "MIT",
+	"support": {
+		"issues": "http://github.com/Copperis/DropdownImageField/issues"
+	},
+	"require": {
+		"silverstripe/framework": "~3.1",
+		"silverstripe/cms": "~3.1"
+	}
+}