Merge pull request #99 from jdorleans/hotfix/installation-doc

#97 - Step-by-step doc installation for this plugin

Author: jimkyndemeyer

README.md

@@ -16,6 +16,40 @@ It provides the following features in IntelliJ IDEA, WebStorm, RubyMine, PhpStor
 
 It depends on [js-graphql-language-service](https://github.com/jimkyndemeyer/js-graphql-language-service) that it manages using a Node.js process handler.
 
+## Installation
+1. Install Node JS
+```
+# Ubuntu
+sudo apt install nodejs
+
+# Mac OS
+brew install node
+```
+
+2. Install Node JS and JS GraphQL Plugin in IntelliJ
+```
+1. File | Settings | Plugins
+2. Search for: nodejs and graphql
+3. Install both plugins and Restart
+```
+
+3. Set Node JS Interpreter in IntelliJ
+```
+1. File | Settings | Languages & Frameworks | Node.js and NPM Node interpreter 
+2. Add... (search for nodejs bin path in your system)
+
+# Ubuntu
+whereis nodejs
+/usr/bin/nodejs
+
+# Mac OS
+which node
+
+# Windows
+where node
+```
+At this point JS GraphQL will recognize your `.graphql` files. However, if you wish to customize your schema, follow the FAQ.
+
 ## Documentation
 
 The plugin uses a `graphql.config.json` file in the project root to configure the location of your GraphQL schema.