adding a flake for RoundedSBE

RoundedSBE/flake.nix

@@ -0,0 +1,21 @@
+{
+  description = "Rounded Sierra Breeze Enhanced";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+
+  outputs = { self, nixpkgs, flake-utils }:
+    flake-utils.lib.eachDefaultSystem
+      (system:
+        let
+          pkgs = nixpkgs.legacyPackages.${system};
+          src = ./.;
+        in 
+        {
+          devShell = import ./shell.nix { inherit pkgs; };
+          defaultPackage = pkgs.libsForQt5.callPackage ./default.nix {};
+        }
+      );
+}