docs: create readme

Author: keplersj

README.md

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+# jest-serializer-json-ld-script
+
+[![Build Status](https://travis-ci.org/keplersj/jest-serializer-json-ld-script.svg?branch=master)](https://travis-ci.org/keplersj/jest-preset-gatsby)
+[![npm version](https://badge.fury.io/js/jest-serializer-json-ld-script.svg)](https://badge.fury.io/js/jest-preset-gatsby)
+
+Jest Snapshot serializer to better visualize React `<script>` elements containing LD+JSON data.
+
+## Installation
+
+Install preset using npm:
+
+```shell
+npm install --save-dev jest-serializer-json-ld-script
+```
+
+or yarn:
+
+```shell
+yarn add --dev jest-serializer-json-ld-script
+```
+
+## Usage
+
+Configure Jest to use the serializer in `jest.config.js`:
+
+```js
+module.exports = {
+  snapshotSerializers: ["jest-serializer-json-ld-script"]
+};
+```
+
+or `package.json`:
+
+```json
+{
+  "jest": {
+    "snapshotSerializers": ["jest-serializer-json-ld-script"]
+  }
+}
+```
+
+## Related Packages
+
+- [`jest-runner-prettier`](https://github.com/keplersj/jest-runner-prettier) - Use Jest to check your codebase against `prettier`
+- [`jest-preset-gatsby`](https://github.com/keplersj/jest-preset-gatsby) - Jest preset to ease unit testing a Gatsby project
+- [`jest-serializer-react-helmet`](https://github.com/keplersj/jest-serializer-react-helmet) - Jest snapshot serializer to include React Helmet side effects in snapshots
+- [`jest-raw-loader`](https://github.com/keplersj/jest-raw-loader) - Load the raw content of files in Jest, replicating the behavior of `webpack`'s `raw-loader`
+
+## License
+
+Copyright 2019 Kepler Sticka-Jones. Licensed ISC