added more scripts and another readme for gdb scripts

gdb/README.md

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+# GDB Scripts
+
+`generic_*.gdb` scripts are designed to be used with a running openocd server. The hardware on that openocd server is mostly irrelevant to these scripts.
+
+`bmp_*.gdb` scripts are meant to be used with the [black magic debugger](https://github.com/blackmagic-debug/blackmagic).

gdb/generic_debug.gdb

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+set pagination off
+set logging file gdb.txt
+set logging on
+set mem inaccessible-by-default off
+target extended-remote localhost:3333
+monitor reset halt
+load

gdb/generic_push.gdb

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+set pagination off
+set logging file gdb.txt
+set logging redirect on
+set logging on
+set remotetimeout 1
+target extended-remote localhost:3333
+load
+monitor reset
+q
+y
+