docs: add jest page

docs/docs/jest/_category_.json

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+{
+  "label": "Testing with Jest",
+  "position": 6
+}

docs/docs/jest/custom-plugins.md

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+---
+title: Jest
+sidebar_position: 3
+slug: /jest
+---
+
+# Testing with Jest
+
+`react-native-esbuild/jest` is a [Jest](https://jestjs.io) transformer.
+
+It can replace [babel-jest](https://github.com/facebook/react-native/blob/v0.72.6/packages/react-native/jest-preset.js#L18) and supports the React Native testing environment.
+
+## Setup
+
+```bash
+# using npm
+npm install -D @react-native-esbuild/jest
+
+# using yarn
+yarn add -D @react-native-esbuild/jest
+```
+
+Open your `jest.config.js` and set `@react-native-esbuild/jest` as transformer.
+
+```js
+// Many react-native npm modules unfortunately don't pre-compile their source code before publishing.
+// If you have npm dependencies that have to be transformed you can add the package name to list. 
+const TRANSFORM_PACKAGES = [
+  'react-native',
+  'jest-react-native',
+  '@react-native',
+  '@react-native-community',
+  '@react-navigation',
+  // ...
+];
+
+/**
+ * @type {import('jest').Config}
+ */
+module.exports = {
+  preset: 'react-native',
+  transform: {
+    '^.+\\.(t|j)sx?$': '@react-native-esbuild/jest',
+  },
+  transformIgnorePatterns: [
+    `node_modules/(?!${TRANSFORM_PACKAGES.join('|')})/`,
+  ],
+};
+```

docs/docs/limitations/_category_.json

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 {
   "label": "Limitations",
-  "position": 7
+  "position": 8
 }

docs/docs/troubleshooting/_category_.json

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 {
   "label": "Troubleshooting",
-  "position": 6
+  "position": 7
 }