Add external package

geographic_info and angles and mavros_msgs

src/external/mavros_msgs/msg/ESCTelemetry.msg

@@ -0,0 +1,10 @@
+# APM ESC Telemetry as returned by BLHeli
+#
+# See:
+# https://mavlink.io/en/messages/ardupilotmega.html#ESC_TELEMETRY_1_TO_4
+# https://mavlink.io/en/messages/ardupilotmega.html#ESC_TELEMETRY_5_TO_8
+# https://mavlink.io/en/messages/ardupilotmega.html#ESC_TELEMETRY_9_TO_12
+
+std_msgs/Header header
+
+mavros_msgs/ESCTelemetryItem[] esc_telemetry