change roles to enum

[todo]

gym/app/src/main/java/it/gym/InitializeDatabase.java

Lines 40 to 43 in 80fb677

 // TODO change roles to enum 
 Arrays.asList(Constants.ROLE_NAMES) 
         .forEach( 
                 a -> { 

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This issue was generated by todo based on a TODO comment in 80fb677. It's been assigned to @DanielMorales9 because they committed the code.