add nix support for building and development (#3)

Author: senyc

default.nix

@@ -0,0 +1,6 @@
+{pkgs}:
+pkgs.rustPlatform.buildRustPackage {
+  name = "kx";
+  cargoHash = "sha256-SNV81sV9lTy/Hymy5xyve9asDIyW8ia/wHjx/JRGz2Q=";
+  src = ./.;
+}

flake.lock

@@ -0,0 +1,21 @@
+{
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/master";
+    flake-utils.url = "github:numtide/flake-utils";
+  };
+  outputs = {
+    self,
+    nixpkgs,
+    flake-utils,
+  }:
+    flake-utils.lib.eachSystem ["x86_64-linux"] (system: let
+      pkgs = nixpkgs.legacyPackages.${system};
+      kx = import ./default.nix {inherit pkgs;};
+    in {
+      packages.default =  kx;
+      devShells.default = pkgs.mkShell {
+        name = "kx";
+        packages = [kx];
+      };
+    });
+}