Update README.md

Author: SteveMacenski

README.md

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 PS: Click on either image to see the demo videos! :-)
 
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 ## Interfaces
 
 The two main interfaces are `NavigateCompleteCoverage` and `ComputeCoveragePath`. The first is the action definition to request the BT Navigator's `CoverageNavigator` plugin to navigate usign a Complete Coverage task input. The latter is an analog to the `PlannerServer`'s action definition for computing Complete Coverage paths using the `opennav_coverage` action server. See `opennav_coverage_msgs` for complete details.