Add README.md

Author: arunoda

examples/with-jest/README.md

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+# Example app using Jest to run tests
+
+This example features:
+
+* A properly configured Next.js app for Jest
+* An example test written with Jest Snapshot Testing
+* An example test written with Enzyme
+
+## How to run it
+
+```sh
+npm install
+npm run dev
+```
+
+## Jest related info
+
+After you've added `jest-cli` and `jest-babel` into your app, make sure to add the following `.babelrc` file.
+
+```json
+{
+    "presets": ["next/babel"]
+}
+```
+
+It'll ask Jest to use the babel configurations used by Next.js.