refactored backend to its own directory to separate front end and backend code

requested review from @heinemb

assigned to @torbjant

added 1 commit

• 5f3d346b - added application.properties to communicate with database

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added 2 commits

• cf4f3908 - added @Table annotation to set table name to quiz in database
• 1f5549f8 - Added logger to AuthenticationController and bean in...

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mentioned in commit f781bbd0

merged