Backup before error handling refactoring

USER/Ref/bmu-18s-firmware/.gitignore

@@ -0,0 +1,35 @@
+# Keil MDK Build Artifacts
+*.obj
+*.o
+*.lib
+*.hex
+*.bin
+*.htm
+*.lnp
+*.dep
+*.map
+*.lst
+*.axf
+*.sct
+*.i
+*.crf
+*.d
+*.bak
+*.uvgui.*
+*.uvguix.*
+*.uvopt
+*.uvoptx
+*.scvd
+
+# Temp/Misc
+main_utf8.c
+dflash_sf1_utf8.c
+ltc6813_comm_utf8.c
+build_log.txt
+hex2bin.exe
+keilkilll.bat
+
+# OS/IDEs
+.vscode/
+.git/
+Thumbs.db