Analyzers.md

+An analyzer is attached to a provider which will notify it when there is data.  
+An analyzer is divided into several steps
+
++ __setup__: Called before starting to analyze a new chain of data.  
+             Use perform Setup specific initialization.  
++ __analyze__: Called whenever the provider has a new event.  
+               Analyze data.  
++ __terminate__: Called when the provider has no more events.  
+                 Use this for anything that requires you to have all data ie. fitting.  
++ __saveToRootFile__: Called if the user wants the results saved to a Root file.  
+                      Use to write your histograms to file.  
+
+Often one should subclass AbstractSortedAnalyzer it will
+1. Save SortedSetupOutput as `output` during `setup`.
+2. Provide no-op implementation of `terminate`. 
+3. Save all `TObject` for which `registerOutput` have been called. 
+
+#### Example implementation
+An example implementation of analysers can be found in the project [AnalyzerExample](https://gitlab.au.dk/ausa/AnalyzerExample).
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