Add installation instructions

README.md

@@ -1 +1,44 @@
 # eslint-config-leapfrog
+
+[![npm version](https://badge.fury.io/js/eslint-config-leapfrog.svg)](https://badge.fury.io/js/eslint-config-leapfrog)
+[![downloads](http://img.shields.io/npm/dt/eslint-config-leapfrog.svg)](https://npmjs.org/package/eslint-config-leapfrog)
+
+Set of [ESLint](https://eslint.org/) rules for JavaScript projects at Leapfrog.
+
+**`eslint-config-leapfrog` adds rules on top of `eslint:recommended` and `plugin:react/recommended`.**
+
+## Requires
+
+* ESLint **>= 4.19.0**
+
+## Usage
+
+Add `eslint-config-leapfrog` as a dev dependency.
+
+```bash
+yarn add eslint-config-leapfrog --dev
+```
+
+Include `eslint-config-leapfrog` in your [.eslintrc](https://eslint.org/docs/user-guide/getting-started#configuration) file.
+
+```json
+{
+  "extends": [
+    "eslint-config-leapfrog"
+  ]
+}
+```
+
+For projects using React, include `eslint-config-leapfrog/react` which contains ESLint rules specific to React.
+
+```json
+{
+  "extends": [
+    "eslint-config-leapfrog/react"
+  ]
+}
+```
+
+## License
+
+[MIT](LICENSE)