add English Accessibility Testing

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[shawnthompson]

@JulieBB23 the English page is ready for review.

In development - Accessibility Testing 101 - Digital Accessibility Toolkit / Sharing space

I don't have the French version.

[shawnthompson]

So remove the following?

Keyboard testing basics

• Go forward: use the tab key
• Go backwards: use the tab and shift keys
• Activate something: use the Enter key or space bar
• To check / uncheck a checkbox: use space bar
• Move around: use the arrow keys

<img>