Need a little help for dev start

Hello,

before I get lost in the source, it would help if I could get some basic 
infos.
Can somebody give me a very short intro to the architecture of otrs 3?

I want to add a new ticket function - something like "Send summary of 
ticket".
Can/Should this be implemented as a package?

Is there somewhere a discription how to create a package?

Thanks
Thomas Kaltenbrunner

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