add graphql resources (#950)

* add react.js resources

* add css resources

* add graphql resources

content/roadmaps/100-frontend/content/119-graphql/readme.md

@@ -1 +1,8 @@
-# Graphql
+# Graphql
+
+GraphQL is a query language for APIs and a runtime for fulfilling those queries with your existing data. GraphQL provides a complete and understandable description of the data in your API, gives clients the power to ask for exactly what they need and nothing more, makes it easier to evolve APIs over time, and enables powerful developer tools.
+
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://graphql.org/learn/'>Introduction to GraphQL</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.howtographql.com/'>The Fullstack Tutorial for GraphQL</BadgeLink>
+<BadgeLink colorScheme='green' badgeText='Course' href='https://odyssey.apollographql.com/'>GraphQL Tutorials</BadgeLink>