add nix environment for developpement

shell.nix

@@ -0,0 +1,22 @@
+{ pkgs ? import <nixpkgs> {} }:
+pkgs.mkShell {
+  nativeBuildInputs = with pkgs; [
+    rustup
+    rustfmt
+    clippy
+    gcc
+    pkg-config
+  ];
+
+  buildInputs = with pkgs; [
+    openssl
+    cabextract
+  ];
+
+  shellHook = ''
+    export OPENSSL_DIR="${pkgs.openssl.dev}"
+    export PKG_CONFIG_PATH="${pkgs.openssl.dev}/lib/pkgconfig"
+    export OPENSSL_NO_VENDOR=1
+    export OPENSSL_LIB_DIR="${pkgs.lib.getLib pkgs.openssl}/lib"
+  '';
+}