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Class Summary
| Class | 
Description | 
| BaseEntity | 
 the BaseEntity class 
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| Device | 
 maps the devices and contains their name and status 
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| Expansion | 
 is the basic class for every additional expansions of the playground 
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| Friend | 
 class to map the friends list to the 
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| Location | 
 identifies the playground location
 it contains the adress and is expanded by the district 
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| Picture | 
 class to access the pictureFiles via database 
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| Playground | 
 is the basic class to map a playground
 is used as the data base for the user acces 
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| User | 
 this class is used to map the user
 it contains also the accessLevel, playgoundFavorites and friends
 shows the currently accessed playgound 
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