Merge pull request #1 from hacklschorsch/add-nix-shell

Add shell.nix to install build requirements using Nix

shell.nix

@@ -0,0 +1,22 @@
+# This installs the build requirements using Nix.
+# Enter environment using `nix-shell` and continue from README.md's '## Setup Steps'
+
+let
+  rust_overlay = import (builtins.fetchTarball "https://github.com/oxalica/rust-overlay/archive/master.tar.gz");
+  pkgs = import <nixpkgs> { overlays = [ rust_overlay ]; };
+in
+with pkgs;
+mkShell {
+  buildInputs = [
+    nodejs
+    wasm-pack
+    pkg-config
+    openssl
+    binaryen # For wasm-opt (optional, but nice to have no warnings)
+    (rust-bin.fromRustupToolchain {
+      channel = "stable";
+      components = [ "cargo" ];
+      targets = [ "wasm32-unknown-unknown" ];
+    })
+  ];
+}