test: Add summary comment for test prerequisite

[Dor-bl]

List of changes

Added summary comment that explains the prerequisite for the test to pass. The comment indicates that the Appium server needs to be run with a specific command (appium --allow-insecure get_server_logs). The test method (CanCaptureServerTest) then checks various conditions related to server logs using assertions.

Types of changes

What types of changes are you proposing/introducing to the .NET client?
Put an x in the boxes that apply

• Bugfix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• New feature (non-breaking change which adds value to the project)
• Breaking change (fix or feature that would cause existing functionality not to work as expected)

Documentation

• Have you proposed a file change/ PR with appium to update documentation?

This can be done by navigating to the documentation section on http://appium.io selecting the appropriate command/endpoint and clicking the 'Edit this doc' link to update the C# example

Integration tests

• Have you provided integration tests to pass against the beta version of appium? (for Bugfix or New feature)

Details

Please provide more details about changes if it is necessary. If there are new features you can provide code samples showing how they work and possible use cases. Also, you can create gists with pasted C# code samples or put them here using markdown.
About markdown please read Mastering markdown and Writing on GitHub