Update .gitignore

Added .gitattributes file.

Update README.md

Update README.md

Update README.md

Update README.md

Update README.md

Update README.md

Update README.md

Update README.md

Update README.md

Update Server.java

Update ServerList.java

Update StaffList.java

Update Customer.java

Update .gitattributes

Update StaffListTest.java

Update StaffListTest.java

Update ServerListTest.java

Update Stackable.java