Add npm packages

Author: rtsao

.prettierrc

@@ -0,0 +1,6 @@
+{
+  "trailingComma": "all",
+  "tabWidth": 2,
+  "semi": true,
+  "singleQuote": false
+}

copy-binary.js

@@ -0,0 +1,17 @@
+const os = require("os");
+const fs = require("fs");
+const path = require("path");
+
+const key = `${process.platform} ${os.arch()} ${os.endianness()}`;
+const packages = {
+  "darwin x64 LE": "cssparse-darwin-64",
+  "linux x64 LE": "cssparse-linux-64",
+  "win32 x64 LE": "cssparse-windows-64",
+};
+
+const id = packages[key];
+
+const src = path.join(__dirname, "native", "index.node");
+const dest = path.join(__dirname, "npm", "node_modules", id, `${id}.node`);
+
+fs.copyFileSync(src, dest);