Add MATRIC Client software to README

[wast]

Description

Addition to Client software list in README

Motivation and Context

Completeness of Client software list.

How Has This Been Tested?

Nothing to test.

Types of changes

• Documentation change (a change to documentation pages)

Checklist:

• I have read the Contributing Guidelines.
• All commit messages are properly formatted and commits squashed where appropriate.
• My code is not on master or a release/* branch.
• The code has been tested.
• I have included updates to all appropriate documentation.

[wast]

@tt2468 why was this closed?

[tt2468]

If you hover over the close message: https://i.imgur.com/hEdpMMl.png

I did the commit myself because the commit in this PR did not follow the contributing guidelines.