Revert "Delete VendingMachineKata.sln"

This reverts commit 98a96161e7a988d161431950c95e60d5958d8fd2.
Revert "Delete VendingMachineKata.v12.suo"

This reverts commit dbca4c63eef164d6b1f78ec87a54c57cd20a5e33.