Create mc_06_optical_flow.md

docs/en/test_cards/mc_06_optical_flow.md

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+# Test MC_06 - Optical Flow
+
+## Objective
+
+To test that optical flow / external vision work as expected
+
+## Preflight
+
+Disconnect all GPS / compasses and ensure vehicle is using optical flow for navigation
+
+Ensure that the drone can go into Altitude, Position mode while still on the ground
+
+## Flight Tests
+
+❏ Altitude
+
+    ❏ Vertical position should hold current value with stick centered
+
+    ❏ Pitch/Roll/Yaw response 1:1
+
+    ❏ Throttle response set to Climbs/Descend rate
+
+❏ Position
+
+    ❏ Horizontal position should hold current value with stick centered
+
+    ❏ Vertical position should hold current value with stick centered
+
+    ❏ Throttle response set to Climbs/Descend rate
+
+    ❏ Pitch/Roll/Yaw response set to Pitch/Roll/Yaw rates
+
+❏ Landing
+
+    ❏ Land in Position mode with the throttle below 40%