Add initial flake.nix configuration

Initial creation of flake.nix with project description and system configurations.

flake.nix

@@ -0,0 +1,35 @@
+{
+  description = "Description for the project";
+
+  inputs = {
+    flake-parts.url = "github:hercules-ci/flake-parts";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  };
+
+  outputs = inputs@{ flake-parts, ... }:
+    flake-parts.lib.mkFlake { inherit inputs; } {
+      imports = [
+        # To import an internal flake module: ./other.nix
+        # To import an external flake module:
+        #   1. Add foo to inputs
+        #   2. Add foo as a parameter to the outputs function
+        #   3. Add here: foo.flakeModule
+
+      ];
+      systems = [ "x86_64-linux" "aarch64-linux" "aarch64-darwin" "x86_64-darwin" ];
+      perSystem = { config, self', inputs', pkgs, system, ... }: {
+        # Per-system attributes can be defined here. The self' and inputs'
+        # module parameters provide easy access to attributes of the same
+        # system.
+
+        # Equivalent to  inputs'.nixpkgs.legacyPackages.hello;
+        packages.default = pkgs.hello;
+      };
+      flake = {
+        # The usual flake attributes can be defined here, including system-
+        # agnostic ones like nixosModule and system-enumerating ones, although
+        # those are more easily expressed in perSystem.
+
+      };
+    };
+}