Add trigger guide

[brosenberg42]

Issues:

• Update the WFM to support an optional TRIGGER property on any action openmpf#1574

Related PRs:

• Feat/wfm trigger openmpf#1644
• Feat/wfm trigger openmpf-components#336
• Feat/wfm trigger openmpf-contrib-components#88
• Feat/wfm trigger openmpf-cpp-component-sdk#121
• Remove TriggeredJobConfig openmpf-python-component-sdk#71
• Get rid of GetDetectionType openmpf-java-component-sdk#63

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This change is 

[jrobble]

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[jrobble]

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[jrobble]

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a discussion (no related file):
Please remove the GetDetectionType() from the SDK docs. Also, trackType needs to be added to "Component Descriptor Reference".

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[jrobble]

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[brosenberg42]

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a discussion (no related file):

Previously, jrobble (Jeff Robble) wrote…

Please remove the GetDetectionType() from the SDK docs. Also, trackType needs to be added to "Component Descriptor Reference".

Done.

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[jrobble]

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docs/docs/Trigger-Guide.md line 188 at r7 (raw file):

that will later satisfy the trigger for stage 4.

Also, note that stages 1, 2, and 3 can all accept an optional `WHITELIST_FILE` property that can be

This section will need to be changed to "approved list" once your other PR lands. I will leave a comment on that.