Add CLI entry point and main index

bin/typeflow

@@ -0,0 +1,13 @@
+#!/usr/bin/env node
+
+const path = require('path');
+const fs = require('fs');
+
+const distPath = path.resolve(__dirname, 'dist/cli.js');
+
+if (fs.existsSync(distPath)) {
+  require(distPath);
+} else {
+  console.error('Error: TypeFlow has not been built yet. Run "npm run build" first.');
+  process.exit(1);
+}