Adds demo webpack

Author: NejcZdovc

.gitignore

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+.DS_Store
+.idea
+node_modules
+demo/demo-dist

README.md

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+function main () {
+  console.log('Hi')
+}
+
+main()

demo/index.js

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+const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin
+const path = require('path')
+
+module.exports = function (_env) {
+  return {
+    entry: path.resolve(__dirname, 'index.js'),
+    output: {
+      path: path.resolve(__dirname, 'demo-dist'),
+      filename: './index.js'
+    },
+    plugins: [
+      new BundleAnalyzerPlugin({
+        analyzerMode: 'disabled',
+        generateStatsFile: true
+      })
+    ]
+  }
+}