[w3c/gamepad] Add conformance section (#125)

See https://github.com/w3c/respec/issues/2580 for why this is needed.
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/gamepad/pull/125

-- Commit Summary --

  * Add conformance section

-- File Changes --

    M extensions.html (2)

-- Patch Links --

https://github.com/w3c/gamepad/pull/125.patch
https://github.com/w3c/gamepad/pull/125.diff

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https://github.com/w3c/gamepad/pull/125