Add .gitignore

.gitignore

@@ -0,0 +1,35 @@
+GPATH
+GRTAGS
+GSYMS
+GTAGS
+INSTALL
+Makefile
+Makefile.in
+aclocal.m4
+autom4te.cache/
+config.guess
+config.h
+config.h.in
+config.log
+config.status
+config.sub
+configure
+depcomp
+install-sh
+libtool
+ltmain.sh
+missing
+modbus.pc
+.deps
+.libs
+*.la
+*.lo
+stamp-h1
+*.o
+tests/bandwidth-master
+tests/bandwidth-slave-many-up
+tests/bandwidth-slave-one
+tests/random-test-master
+tests/random-test-slave
+tests/unit-test-master
+tests/unit-test-slave