Installation notes, future directions

As of June 26th 2021 we added an installation script and more detailed installation instructions. Our aim is to add specific installation scripts so that most computer users can use our library (we will eventually cover popular distributions of Linux, Windows and Macs). Many engineers in the imaging informatics community use simpleITK and may find dependancy conflicts in our package. Therefore we are planning a code-free version which will ease use for not only biomedical engineers who work with radiology images, but also for medical doctors who may have no coding skills.