improve docs

CONTRIBUTING.md

@@ -20,6 +20,9 @@ Contributions are always welcome. If you don't know how you can help, you can ch
 For updating `core-js-compat` data:
 
 - If you want to add new data for a browser, run in this browser [`tests/compat/index.html`](http://es6.zloirock.ru/compat/) and you will see what `core-js` modules are required for this browser.
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+![compat-table](https://user-images.githubusercontent.com/2213682/173199354-1f3aeb83-7231-46b2-8a14-a9d47ce3ae45.png)
+
 - If you want to add new data for NodeJS, run `npm run compat-node` with the installed required NodeJS version and you will see the results in the console. Use `npm run compat-node-json` if you want to get the result as JSON.
 - If you want to add new data for Deno, run `npm run compat-deno` with the installed required Deno version and you will see the results in the console. Use `npm run compat-deno-json` if you want to get the result as JSON.
 - If you want to add new data for Rhino, set the required Rhino version in `compat-rhino-prepare` NPM script in [`package.json`](./package.json), run `npm run compat-rhino` and you will see the results in the console.