Added resources
Created by: GustavBertram
Added a bunch of resources from https://stackoverflow.com/documentation/common-lisp/534/getting-started-with-common-lisp/27861/common-lisp-learning-resources#t=201703281952155730075
Created by: GustavBertram
Added a bunch of resources from https://stackoverflow.com/documentation/common-lisp/534/getting-started-with-common-lisp/27861/common-lisp-learning-resources#t=201703281952155730075