[WIP] add makefu nixpkgs (#69)

the repository is shared between multiple parties.
I use my sub-directory with the nur.nix file to export my packages

repos.json

@@ -25,6 +25,11 @@
         "ma27": {
             "url": "https://gitlab.com/Ma27/nur-packages"
         },
+        "makefu": {
+            "file": "makefu/5pkgs/nur.nix",
+            "type": "gitlab",
+            "url": "https://git.shackspace.de/krebs/stockholm"
+        },
         "manveru": {
             "url": "https://github.com/manveru/nur-packages"
         },