Add files

firmware/.gitignore

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+# Created by https://www.toptal.com/developers/gitignore/api/c++
+# Edit at https://www.toptal.com/developers/gitignore?templates=c++
+
+### C++ ###
+# Prerequisites
+*.d
+
+# Compiled Object files
+*.slo
+*.lo
+*.o
+*.obj
+
+# Precompiled Headers
+*.gch
+*.pch
+
+# Compiled Dynamic libraries
+*.so
+*.dylib
+*.dll
+
+# Fortran module files
+*.mod
+*.smod
+
+# Compiled Static libraries
+*.lai
+*.la
+*.a
+*.lib
+
+# Executables
+*.exe
+*.out
+*.app
+
+# End of https://www.toptal.com/developers/gitignore/api/c++
+*.jdebug
+
+obj/*