* Added some media for incoming demos on SQL Graph database
* Added the file README.md and the first demo of the session SQL Server 2017 Graph Database that I have done at SQL Saturday Parma 2017 #sqlsat675
* Fixed a bug in SQL text visualization
* Deleted some Unicode characters
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* Update README.md added the demo "Build a sample recommendation system using SQL Graph"
* Added the file sqlsat675 40 Recommendation system.sql that contains source code of the demo "Build a sample recommendation system using SQL Graph"
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* Added the file sqlsat675 30 Many-to-many relationships.sql
* Delete folder sql-saturday-675-parma-italy
* Add folder recommendation-system
* Rename files
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* Update media file related to SQL Graph demos
* Used function JSON_VALUE instead of OPENJSON to extract the first language of a Person
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