Added niv folder

nix/sources.json

@@ -0,0 +1,26 @@
+{
+    "home-manager": {
+        "branch": "release-21.11",
+        "description": "Manage a user environment using Nix  [maintainer=@rycee] ",
+        "homepage": "https://nix-community.github.io/home-manager/",
+        "owner": "nix-community",
+        "repo": "home-manager",
+        "rev": "28b9ae40c45c5e7711c353fee1b7af734e293979",
+        "sha256": "0b735d1wk53rnjrz1glvd4mxxf14q8sj5f1pkf4qsll770z8csfv",
+        "type": "tarball",
+        "url": "https://github.com/nix-community/home-manager/archive/28b9ae40c45c5e7711c353fee1b7af734e293979.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    },
+    "niv": {
+        "branch": "master",
+        "description": "Easy dependency management for Nix projects",
+        "homepage": "https://github.com/nmattia/niv",
+        "owner": "nmattia",
+        "repo": "niv",
+        "rev": "5830a4dd348d77e39a0f3c4c762ff2663b602d4c",
+        "sha256": "1d3lsrqvci4qz2hwjrcnd8h5vfkg8aypq3sjd4g3izbc8frwz5sm",
+        "type": "tarball",
+        "url": "https://github.com/nmattia/niv/archive/5830a4dd348d77e39a0f3c4c762ff2663b602d4c.tar.gz",
+        "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
+    }
+}