Add changelog

Fix the errors

Add Pull and Stream exercises

Add Pull and Stream exercises

Add applications.md

Add error-handling.md

Add error-handling.md

Fix reduction exercises

Fix reduction exercises

Split some exercises

Add expandable.md

Add conclusion.md

Split some exercises

Split some exercises

Split some exercises

Split some exercises

Split some exercises

Add stream.md

Add stream processing exercises

Add stream processing exercises

Add stream.md

Add stream.md

Add create-pull.md

Add stream-processing.md

Add stream-processing.md

Add stream processing exercises

Rename exercises and type classes

Rename exercises and type classes

Rename exercises and type classes

Add stream-processing.md

Add stream-processing.md

Add stream processing exercises

Add stream processing exercises

Add stream processing exercises

Add stream processing exercises

Add sonar checking