TBS Discovery stl files and params file (#40)

* Added stl files from the private skypad repo

* added px4 settings file for skypad

* Added the px4flow firmware with modified settings

Author: vijay609

tools/platforms/skypad/DJI F450 Flamewheel Arm Extension.stl

@@ -0,0 +1,20 @@
+# Onboard parameters for Vehicle 1
+#
+# Stack: PX4 Pro
+# Vehicle: Multi-Rotor
+# Version: 1.7.0 
+# Git Revision: cbdb08bb6109c1ea
+#
+# Vehicle-Id Component-Id Name Value Type
+1	1	LPE_FAKE_ORIGIN	1	6
+1	1	LPE_FLW_QMIN	75	6
+1	1	LPE_FUSION	210	6
+1	1	LPE_LAT	0.000000000000000000	9
+1	1	LPE_LON	0.000000000000000000	9
+1	1	LPE_VXY_PUB	0.800000011920928955	9
+1	1	MIS_TAKEOFF_ALT	1.500000000000000000	9
+1	1	MPC_ALT_MODE	1	6
+1	1	MPC_XY_P	0.500000000000000000	9
+1	1	MPC_XY_VEL_MAX	2.000000000000000000	9
+1	1	SYS_COMPANION	921600	6
+1	1	SYS_MC_EST_GROUP	1	6