Add Neo4j ebooks (#4173)

* Add Neo4j books

* Add book format

* Add authors

free-programming-books.md

@@ -2003,8 +2003,10 @@ Kerridge (PDF) (email address *requested*, not required)
 
 ### Neo4J
 
-* [Graph Databases](http://info.neotechnology.com/rs/neotechnology/images/GraphDatabases.pdf) (PDF)
-* [Graph Databases 2nd edition](http://neo4j.com/books/graph-databases/) *(account required)*
+* [Fullstack GraphQL Applications with GRANDStack – Essential Excerpts](https://neo4j.com/fullstack-graphql-applications-with-grandstack/) - William Lyon (PDF) *(email requested)*
+* [Graph Algorithms: Practical Examples in Apache Spark and Neo4j](https://neo4j.com/graph-algorithms-book/) - Mark Needham and Amy E. Hodler (PDF, EPUB, MOBI) *(email requested)*
+* [Graph Databases 2nd edition](http://neo4j.com/books/graph-databases/) - Ian Robinson, Jim Webber and Emil Eifrém (PDF, EPUB, MOBI) *(email requested)*
+* [Graph Databases For Dummies](https://neo4j.com/graph-databases-for-dummies/) - Dr. Jim Webber and Rik Van Bruggen (PDF) *(email requested)*
 
 
 ### .NET Framework