Revert "Create README.md"

This reverts commit c1968a3952b7eb0945b9b3ce233f2fb635130ea0.
Revert "deleted readme"

This reverts commit 39105ef470a42679a3425f08e661dee632de2af6.
edited talk based on Chris' feedback
broke up exercise 3 into 3 parts, individual parts must be rehashed.