add .gdbinit as Debug/dot.gdbinit

very useful for JTAG debugging

Debug/dot.gdbinit

+# copy the file to .gdbinit in your Firmware tree, and adjust the path
+# below to match your system
+# For example:
+# target extended /dev/serial/by-id/usb-Black_Sphere_Technologies_Black_Magic_Probe_DDE5A1C4-if00
+# target extended /dev/ttyACM4
+
+
+monitor swdp_scan
+attach 1
+monitor vector_catch disable hard
+set mem inaccessible-by-default off
+set print pretty
+source Debug/PX4