Merge pull request #4 from benjie/ide-monorepo-readme

Add README to monorepo root

README.md

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+# GraphiQL Monorepo
+
+_/ˈɡrafək(ə)l/_ A graphical interactive in-browser GraphQL IDE. [Try the live demo](http://graphql.org/swapi-graphql).
+
+[![Build Status](https://travis-ci.org/graphql/graphiql.svg?branch=master)](https://travis-ci.org/graphql/graphiql)
+[![CDNJS](https://img.shields.io/cdnjs/v/graphiql.svg)](https://cdnjs.com/libraries/graphiql)
+[![npm](https://img.shields.io/npm/v/graphiql.svg)](https://www.npmjs.com/package/graphiql)
+
+[![](resources/graphiql.png)](http://graphql.org/swapi-graphql)
+
+## Intro
+
+GraphiQL is the reference implementation of a GraphQL IDE, an official
+project under the GraphQL Foundation.
+
+This repository contains much of the code that powers GraphiQL, split into
+modules that can be used to build custom/alternative editors. The code uses
+the permissive MIT license. The main components in this monorepo are:
+
+- [GraphiQL](packages/graphiql/README.md) - the GraphiQL IDE, implemented in React
+- [GraphQL mode for CodeMirror](packages/codemirror-graphql/README.md) - provides CodeMirror with a parser mode for GraphQL along with a live linter and typeahead hinter powered by your GraphQL Schema
+
+## Contributing
+
+This is an open source project, and we welcome contributions. Please see
+[CONTRIBUTING.md](CONTRIBUTING.md) for details on how to contribute.