Merge pull request #180 from ktaranov/master

Create new permissions-posters folder, add some new posters

Author: uc-msft

samples/features/security/pwermissions-posters/Permissions_Poster_SQL_Server_2008_R2.pdf

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+# Microsoft SQL Server Permissions Posters
+
+Useful link: http://social.technet.microsoft.com/wiki/contents/articles/11842.sql-server-database-engine-permission-posters.aspx
+
+ - [Microsoft SQL Server 2008 R2 Permissions Poster](Permissions_Poster_SQL_Server_2008_R2.pdf)
+ - [Microsoft SQL Server 2012 Permissions Poster](Permissions_Poster_SQL_Server_2012.pdf)
+ - [Microsoft SQL Server 2014 Permissions Poster](Permissions_Poster_SQL_Server_2014.pdf)
+ - [Microsoft SQL Server 2016 and SQLDB Permissions Poster](Permissions_Poster_SQL_Server_2016_and_SQLDB.pdf)
+ - [Microsoft SQL Server VNext and SQLDB Permissions Poster](Permissions_Poster_SQL_Server_vNext_and_SQLDB.pdf)
+