moving flake file and additional gitignore changes to branch

.gitignore

@@ -42,3 +42,7 @@ p2prc.PublicKeyBareMetal
 
 # Ignore pem files
 *.pem
+
+# Nix and Nix flake files
+result
+result-*

flake.nix

@@ -0,0 +1,31 @@
+{
+  description = "P2PRC nix flake";
+
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-unstable";
+  inputs.flake-utils.url = "github:numtide/flake-utils";
+  inputs.gomod2nix.url = "github:nix-community/gomod2nix";
+  inputs.gomod2nix.inputs.nixpkgs.follows = "nixpkgs";
+  inputs.gomod2nix.inputs.flake-utils.follows = "flake-utils";
+
+  outputs = { self, nixpkgs, flake-utils, gomod2nix }:
+    (flake-utils.lib.eachDefaultSystem
+      (system:
+        let
+          pkgs = nixpkgs.legacyPackages.${system};
+
+          # The current default sdk for macOS fails to compile go projects, so we use a newer one for now.
+          # This has no effect on other platforms.
+          callPackage = pkgs.darwin.apple_sdk_11_0.callPackage or pkgs.callPackage;
+        in
+        {
+
+          # packages.default = callPackage ./. {
+            # inherit (gomod2nix.legacyPackages.${system}) buildGoApplication;
+          # };
+
+          devShells.default = callPackage ./shell.nix {
+            inherit (gomod2nix.legacyPackages.${system}) mkGoEnv gomod2nix;
+          };
+        })
+    );
+}