Update README.md

Author: rwieruch

README.md

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 A full-fledged Apollo Server with Apollo Client starter project with React and Express. [Read more about it in this tutorial to build it yourself](https://www.robinwieruch.de/graphql-apollo-server-tutorial/).
 
-**This repository is the fullstack React client. You can find various working server applications that can be used with this client in the list below:**
+**Family of universal fullstack repositories:**
 
-* [PostgreSQL](https://github.com/the-road-to-graphql/fullstack-apollo-express-postgresql-boilerplate)
-* [MongoDB](#)
+Server Applications:
+
+* [Node.js with Express + MongoDB](https://github.com/the-road-to-graphql/fullstack-apollo-express-mongodb-boilerplate)
+* [Node.js with Express + PostgreSQL](https://github.com/the-road-to-graphql/fullstack-apollo-express-postgresql-boilerplate)
+
+Client Applications:
+
+* [React Client](https://github.com/the-road-to-graphql/fullstack-apollo-react-boilerplate)
 
 ## Features of Client + Server