fix(docs): Update readme with instructions

Author: nickmanks

README.md

@@ -1,2 +1,19 @@
 # eslint-config-react
 React eslint config for ecma script standard (stage 2)
+
+## Usage
+
+```bash
+npm i -D @skan-io/eslint-config-react
+```
+
+In `.eslintrc`:
+
+```
+root: true
+
+extends:
+  - '@skan-io/eslint-config-react'
+```
+
+**NOTE:** may need to restart your editor for config to take effect