Add 2021 final solutions

previous-exams/2021-final-solutions/f1/.gitignore

previous-exams/2021-final-solutions/f1/assignment.sbt

previous-exams/2021-final-solutions/f1/build.sbt

previous-exams/2021-final-solutions/f1/grading-tests.jar

...-final-solutions/f1/project/FilteringReporterPlugin.scala

...-exams/2021-final-solutions/f1/project/MOOCSettings.scala

...-exams/2021-final-solutions/f1/project/StudentTasks.scala

...us-exams/2021-final-solutions/f1/project/build.properties

...s-exams/2021-final-solutions/f1/project/buildSettings.sbt

previous-exams/2021-final-solutions/f1/project/plugins.sbt

...-exams/2021-final-solutions/f1/src/main/scala/f1/F1.scala

...1-final-solutions/f1/src/main/scala/f1/MyComponents.scala

...s/2021-final-solutions/f1/src/test/scala/f1/F1Suite.scala

previous-exams/2021-final-solutions/f2/.gitignore

previous-exams/2021-final-solutions/f2/assignment.sbt

previous-exams/2021-final-solutions/f2/build.sbt

previous-exams/2021-final-solutions/f2/grading-tests.jar

...-final-solutions/f2/project/FilteringReporterPlugin.scala

...-exams/2021-final-solutions/f2/project/MOOCSettings.scala

...-exams/2021-final-solutions/f2/project/StudentTasks.scala