Create data_mode.md

vocabularyCollection/data_mode.md

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+| data_mode | descritpion | status |
+|:------ |:------- |:-------|
+| R | Real-time data. Data coming from the glider through a communication channel without physical access to the instruments, disassembly or recovery of the platform | pending |
+| P | Provisional data. Data obtained after the glider has been recovered or serviced | pending |
+| A | Real-time adjusted data. Real-time or provisional data that have been adjusted by real-time automatic procedures | pending |
+| D | Delayed-mode data. Data published after all calibrations and quality control procedures have been applied on the internally recorded or best available original data. This is the best possible version of processed data | pending |
+| M | Mixed data. This value indicates that the file contains data in more than one of the above states | pending |