Added a simple MSO68B example using tm_devices.

[Gaylandp]

Pull Request Checklist

Please review the Contribution Guidelines before submitting.

• [X ] Pulling against the master branch (left side).
• [X ] You have previously submitted a Contributor License Agreement or have contacted a maintainer to request one.

Type (Select only one)

• Bug fix
• [X ] Working example
• In-progress example (need Tektronix help)
• In-progress example (does not need Tektronix help)

Description

This example is a simple python script that takes a couple of simple measurements and saves those to a file. This uses the new tm_devices.