Initial commit (#368).

src/test/resources/org/gitlab4j/api/registry-repositories.json

+[
+  {
+    "id": 1,
+    "name": "",
+    "path": "group/project",
+    "location": "gitlab.example.com:5000/group/project",
+    "created_at": "2019-01-10T13:38:57.391Z"
+  },
+  {
+    "id": 2,
+    "name": "releases",
+    "path": "group/project/releases",
+    "location": "gitlab.example.com:5000/group/project/releases",
+    "created_at": "2019-01-10T13:39:08.229Z"
+  }
+]