Add control event articles

[adegeo]

Summary

• Added events overview for controls.
• Added How to handle events.
• Moved a common image to the shared folder.

Contributes to #76

@luisquintanilla

Preview Links:

File Type	File Name	Published Url
Content	dotnet-desktop-guide/net/winforms/controls/events.md	https://review.docs.microsoft.com/en-us/dotnet/desktop/winforms/controls/events?view=netdesktop-5.0&branch=pr-en-us-1113
Content	dotnet-desktop-guide/net/winforms/controls/how-to-add-an-event-handler.md	https://review.docs.microsoft.com/en-us/dotnet/desktop/winforms/controls/how-to-add-an-event-handler?view=netdesktop-5.0&branch=pr-en-us-1113
Content	dotnet-desktop-guide/framework/winforms/controls/how-to-add-an-event-handler.md	https://review.docs.microsoft.com/en-us/dotnet/desktop/winforms/controls/how-to-add-an-event-handler?view=netframeworkdesktop-4.8&branch=pr-en-us-1113
Content	dotnet-desktop-guide/net/winforms/controls/how-to-add-a-picture-to-a-control.md	https://review.docs.microsoft.com/en-us/dotnet/desktop/winforms/controls/how-to-add-a-picture-to-a-control?view=netdesktop-5.0&branch=pr-en-us-1113
Content	dotnet-desktop-guide/net/winforms/controls/how-to-set-the-display-text.md	https://review.docs.microsoft.com/en-us/dotnet/desktop/winforms/controls/how-to-set-the-display-text?view=netdesktop-5.0&branch=pr-en-us-1113
Content	dotnet-desktop-guide/net/winforms/how-to-connect-multiple-events-to-a-single-event-handler-in-windows-forms.md	https://review.docs.microsoft.com/en-us/dotnet/desktop/winforms/how-to-connect-multiple-events-to-a-single-event-handler-in-windows-forms?view=netdesktop-5.0&branch=pr-en-us-1113
Content	dotnet-desktop-guide/net/winforms/how-to-create-event-handlers-at-run-time-for-windows-forms.md	https://review.docs.microsoft.com/en-us/dotnet/desktop/winforms/how-to-create-event-handlers-at-run-time-for-windows-forms?view=netdesktop-5.0&branch=pr-en-us-1113
Resource	dotnet-desktop-guide/net/winforms/controls/media/how-to-add-an-event-handler/visual-studio-properties-events-click.png	https://review.docs.microsoft.com/en-us/dotnet/desktop/winforms/controls/media/how-to-add-an-event-handler/visual-studio-properties-events-click.png?view=netdesktop-5.0&branch=pr-en-us-1113
Resource	dotnet-desktop-guide/net/winforms/media/shared/visual-studio-chevron-button.png	https://review.docs.microsoft.com/en-us/dotnet/desktop/winforms/media/shared/visual-studio-chevron-button.png?view=netdesktop-5.0&branch=pr-en-us-1113
Resource	dotnet-desktop-guide/net/winforms/media/shared/visual-studio-ellipsis-button.png	https://review.docs.microsoft.com/en-us/dotnet/desktop/winforms/media/shared/visual-studio-ellipsis-button.png?view=netdesktop-5.0&branch=pr-en-us-1113
Resource	dotnet-desktop-guide/net/winforms/media/shared/visual-studio-events-button.png	https://review.docs.microsoft.com/en-us/dotnet/desktop/winforms/media/shared/visual-studio-events-button.png?view=netdesktop-5.0&branch=pr-en-us-1113
Toc	dotnet-desktop-guide/net/winforms/toc.yml	https://review.docs.microsoft.com/en-us/dotnet/desktop/winforms/toc.json?view=netdesktop-5.0&branch=pr-en-us-1113

[luisquintanilla]

@adegeo looks good to me. Added a few comments.

[luisquintanilla]

Suggestion: Make heading more descriptive. Below is an idea, though it may be a bit wordy. Feel free to cut / wordsmith to whatever you thing is appropriate

Suggested change

	## Designer
	## Handle events in Visual Studio Visual Designer

[adegeo]

How does it sound now?

[luisquintanilla]

Similar comment to "Designer" H2. Make it more descriptive. i.e. "Handle events programmatically", "Handle events at run-time", "Handle events (code-first)"

[adegeo]

@luisquintanilla How does this sound? I used the same format on the other article too. I'm trying not to be too wordy on the headings because they're wrapping.

[luisquintanilla]

Changes look good. The only item outstanding is VB content showing up for C#.

[adegeo]

@luisquintanilla Really there isn't anything I can do about it. But I have to call it out. I at least added it to a section named Visual Basic so it's clearer.

[adegeo]

@luisquintanilla thanks a bunch for the good review!