Init Nix flake and create Nix package

flake.nix

@@ -0,0 +1,23 @@
+{
+  description = "Flake which provides support for OpenHAB importer tool package as well as convinient module";
+
+  inputs = {
+    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+    flake-utils.inputs.nixpkgs.follows = "nixpkgs";
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+    flake-utils,
+  }:
+    flake-utils.lib.eachDefaultSystem (system: let
+      pkgs = nixpkgs.legacyPackages.${system};
+    in {
+      packages = rec {
+        oh-importer = pkgs.callPackage ./package.nix {};
+        default = oh-importer;
+      };
+    });
+}