Added package.json.

composer.json

@@ -1,10 +1,19 @@
 {
+    "name": "daniel-km/omeka-s-module-group",
+    "description": "Module for Omeka S to set groups to users and resources, so their visibility can be managed in a more flexible way.",
+    "license": "CECILL-2.1",
+    "authors": [
+        {
+            "name": "Daniel Berthereau",
+            "email": "Daniel.github@Berthereau.net"
+        }
+    ],
     "require-dev": {
         "biblibre/omeka-s-test-helper": "dev-master"
     },
     "autoload-dev": {
         "psr-4": {
-            "GroupUserTest\\": "test/GroupTest/"
+            "GroupTest\\": "test/GroupTest/"
         }
     }
 }