Add solution to the 2021 midterm

previous-exams/2021-midterm/m15/grading-tests.jar

...ms/2021-midterm/m15/project/FilteringReporterPlugin.scala

previous-exams/2021-midterm/m15/project/MOOCSettings.scala

previous-exams/2021-midterm/m15/project/StudentTasks.scala

previous-exams/2021-midterm/m15/project/build.properties

previous-exams/2021-midterm/m15/project/buildSettings.sbt

previous-exams/2021-midterm/m15/project/plugins.sbt

...idterm/m15/src/main/scala/m15/AbstractBlockingQueue.scala

...m/m15/src/main/scala/m15/AbstractThreadPoolExecutor.scala

previous-exams/2021-midterm/m15/src/main/scala/m15/M15.scala

...s-exams/2021-midterm/m15/src/main/scala/m15/Monitor.scala

...-exams/2021-midterm/m15/src/test/scala/m15/M15Suite.scala

...15/src/test/scala/m15/instrumentation/MockedMonitor.scala

.../scala/m15/instrumentation/SchedulableBlockingQueue.scala

...rm/m15/src/test/scala/m15/instrumentation/Scheduler.scala

...idterm/m15/src/test/scala/m15/instrumentation/Stats.scala

...m/m15/src/test/scala/m15/instrumentation/TestHelper.scala

...rm/m15/src/test/scala/m15/instrumentation/TestUtils.scala

previous-exams/2021-midterm/m2.md

previous-exams/2021-midterm/m2/.gitignore