Add boilerplate

default.nix

@@ -0,0 +1,28 @@
+{
+  stdenv,
+  python3,
+  python3Packages,
+}:
+
+stdenv.mkDerivation {
+  pname = "mechanicaldiff";
+  version = "0.0.1";
+
+  src = ./bin;
+
+  buildInputs = [ python3 ];
+
+  doCheck = true;
+
+  nativeCheckInputs = [ python3Packages.flake8 ];
+
+  checkPhase = ''
+    flake8 mechanicaldiff.py
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp mechanicaldiff.py $out/bin/mechanicaldiff
+    chmod +x $out/bin/mechanicaldiff
+  '';
+}