173 add highlight features to README

[Nic-Ma]

Fixes #173 .

Description

This PR added highlight features(especially medical specific) to README.

Status

Ready

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• Breaking change (fix or new feature that would cause existing functionality to change)
• New tests added to cover the changes
• Docstrings/Documentation updated

[Nic-Ma]

Hi All,

I updated the README with this PR, could you please help review it?

1. The image path is temporarily in this branch, I will change to "master" if approved.
2. You can go to home page of MONAI and switch branch to "173-add-highlight-features-to-README" and the preview will show.
   Thanks.

[wyli]

merged to #177 and further updates go into #177