Create phase.md

vocabularyCollection/phase.md

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+| phase | description | status |
+|:----- |:------ |:------ |
+| ascent | the platform is moving up toward surface with no internal command on the pitch angle | pending |
+| descent | the platform is moving down toward targeted depth of operation with no internal command on the pitch angle | pending |
+| surfacing | the platform is drifting at the surface for communication, recovery or safety purpose | pending |
+| parking | the platform is maintained at a parking depth | pending |
+| inflexion | the platform is changing pitch angle to move from a phase to another | pending |
+| propelled | the platform momentum is increased by the propeller | pending |
+| transition | These particular points could be part of the previous as well as the following phase | pending |