docs(utils): Add how to

close: #641

packages/utils/README.md

@@ -2,4 +2,57 @@
 
 [![](https://img.shields.io/npm/v/@bundle-stats/utils)](https://www.npmjs.com/package/@bundle-stats/utils)
 
-Utilities for BundleStats
+Common utilities for [bundle-stats](https://github.com/relative-ci/bundle-stats) packages.
+
+## How to generate a weback report
+
+```js
+import { createJobs, createReport } from '@bundle-stats/utils';
+import * as webpack from '@bundle-stats/utils/lib/webpack';
+
+// Get webpack stats data
+const WEBPACK_STATS_CURRENT = {/* ... */};
+const WEBPACK_STATS_BASELINE = {/* ... */};
+
+// Create jobs
+const jobs = createJobs([
+  { webpack: WEBPACK_STATS_CURRENT },
+  { webpack: WEBPACK_STATS_BASELINE }
+]);
+
+// Create report
+const report = createReport(jobs);
+
+console.log(report.insights.webpack.assetsSizeTotal.data.text);
+>> Bundle size increased to 9.77KB (+100%).
+```
+
+## Packages
+
+- [CLI](https://github.com/relative-ci/bundle-stats/tree/master/packages/cli)
+- [Webpack](https://github.com/relative-ci/bundle-stats/tree/master/packages/webpack-plugin)
+- [Gatsby](https://github.com/relative-ci/bundle-stats/tree/master/packages/gatsby-plugin)
+- [Next](https://github.com/relative-ci/bundle-stats/tree/master/packages/next-plugin)
+
+
+## Related projects
+
+### [relative-ci.com](https://relative-ci.com)
+
+Continuous monitoring for webpack bundles:
+- Monitor and analyze bundle size, assets, modules, packages
+- Github Checks, Slack integration
+- Support for all major CI services (Travis CI, Circle CI, Jenkins, Gitlab CI, Codeship, etc)
+- Free for OpenSource
+
+[Try Beta](https://relative-ci.com)
+
+### [relative-ci/compare](https://compare.relative-ci.com)
+
+Standalone web application to compare Webpack/Lighthouse/Browsertime stats.
+
+[Compare bundle stats](https://compare.relative-ci.com)
+
+### [bundle-stats-action](https://github.com/vio/bundle-stats-action)
+
+Github Action that generates [bundle-stats](https://github.com/relative-ci/bundle-stats) reports for webpack.