Add DebuggingTips.md with a tip about using apitrace
Add DebuggingTips.md with a tip about using apitrace

BUG=angleproject:892

Change-Id: I0999b0d3b043d412c092350f7d20560cb8b87ff7
Reviewed-on: https://chromium-review.googlesource.com/287450
Reviewed-by: Shannon Woods <0f3694938fd5703bd548127ee497e4d604509bef@chromium.org>
Tested-by: Corentin Wallez <470c533e86f4f848c98c7e11fffc2d043494a401@chromium.org>

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