Add readme.txt

Author: Koseng

fslabs/README.txt

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+### Experimental display version:
+- `FSLABS_A32X_EXPERIMENTAL_DISPLAY_READ_README.mcc` must be loaded in MobiFlight
+- Extends no display version with some display information.
+
+> FSLabs does not provide the FCU values for the display. At some point a value must be synced from general sim data and afterwards kept updated derived from user interaction.
+
+#### Currently supported:
+- Altitude encoder should work well
+- Vertical speed encoder works ok
+- Speed and heading work well when synced
+- Speed and heading sync is only possible on pull when at current speed or heading. No correct display with preselection possible.
+
+#### Not supported:
+- Mach display (planned)
+- TRK/FPA (FPA planned)
+- Dot for managed modes.
+- Speed and heading preselection.
+- Speed and heading sync via turn.
+
+### Advices to sync HDG, SPD and ALT
+- ALT is synced on start to 100. If a resync needs to be performed, select 1000 mode and quickly turn to min or max value to sync.
+- Sync SPD via pull. If off by one push and pull again.
+- Sync HDG via pull. Only correct value when flying straight. If off by one push and pull again.
+- If preselection necessary, sync via pull, when preselected value is reached.