add issue templates

[swissiety]

environment:

• SootUp version
• SootUp configuration (Analysisnputlocations, View, BodyInterceptor)
• relevant AnalysisInputs (ideally broken down to the single classes which are the problem)
• Java Version

report:

• expected behaviour (maybe optional if a stacktrace is given)
• actual observed behaviour
  • if an Exception occured: please include the complete Stacktrace - especially the 'caused by' part