add initial .gitignore

This initial version of .gitignore contains all files created during a
build.

Signed-off-by: Richard Leitner <richard.leitner@skidata.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>

.gitignore

@@ -0,0 +1,20 @@
+configure
+config.h
+config.h.in
+config.log
+config.status
+config.guess
+config.sub
+depcomp
+Makefile
+Makefile.in
+install-sh
+missing
+aclocal.m4
+autom4te.cache/
+.deps/
+*.o
+
+psplash
+psplash-write
+stamp-h1