using solhint-linter

closes #132 (closed)

Motivation and Context

enforced styleguide is a security best-practice

Description of change

The readme now mentions the linter, how to run it and how to act upon its output

What's Next?

Creating issues (or a process) to change all warnings and errors caught by the linter

Please put an x in any of the boxes below that apply:

(This helps us with our follow-up and follow-through work)

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my changes.
• All new and existing tests passed.

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