Add nix package definition and dev shell

default.nix

@@ -0,0 +1,34 @@
+{
+  lib,
+  rustPlatform,
+  pkg-config,
+  dbus,
+  openssl,
+}:
+rustPlatform.buildRustPackage {
+  pname = "iron_heart";
+  version = "0.1.0";
+
+  src = ./.;
+
+  cargoLock = {
+    lockFile = ./Cargo.lock;
+  };
+
+  nativeBuildInputs = [
+    pkg-config
+    openssl
+  ];
+
+  buildInputs = [
+    dbus
+    openssl
+  ];
+
+  meta = with lib; {
+    description = "A BLE Heart Rate Monitor bridge for Social VR, OBS, Data Logging, and more!";
+    homepage = "https://github.com/nullstalgia/iron-heart";
+    license = licenses.mit;
+    maintainers = [];
+  };
+}

flake.nix

@@ -0,0 +1,42 @@
+{
+  description = "A BLE Heart Rate Monitor bridge for Social VR, OBS, Data Logging, and more! ";
+
+  inputs = {
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+    flake-utils.url = "github:numtide/flake-utils";
+
+    rust-overlay.url = "github:oxalica/rust-overlay";
+  };
+
+  outputs = {
+    self,
+    nixpkgs,
+    flake-utils,
+    rust-overlay,
+  }:
+    flake-utils.lib.eachDefaultSystem (
+      system: let
+        pkgs = import nixpkgs {
+          inherit system;
+          overlays = [rust-overlay.overlays.default];
+        };
+      in {
+        packages = rec {
+          iron_heart = pkgs.callPackage ./default.nix {};
+          default = iron_heart;
+        };
+
+        devShells.default = pkgs.mkShell rec {
+          nativeBuildInputs = with pkgs; [
+            rust-bin.stable.latest.default
+            pkg-config
+            dbus
+            openssl
+            rustup # for jetbrains IDE
+          ];
+
+          LD_LIBRARY_PATH = pkgs.lib.makeLibraryPath nativeBuildInputs;
+        };
+      }
+    );
+}