Add a basic .gitignore in the project

.gitignore

@@ -0,0 +1,40 @@
+po/*gmo
+*~
+Makefile
+Makefile.in
+Makefile.in.in
+*.lo
+*.la
+*.o
+.deps/
+.libs/
+src/cryptsetup
+src/veritysetup
+aclocal.m4
+autom4te.cache/
+compile
+config.guess
+config.h
+config.h.in
+config.log
+config.rpath
+config.status
+config.sub
+configure
+depcomp
+install-sh
+lib/libcryptsetup.pc
+libtool
+ltmain.sh
+m4/
+missing
+po/Makevars.template
+po/POTFILES
+po/Rules-quot
+po/*.pot
+po/*.header
+po/*.sed
+po/*.sin
+po/stamp-po
+stamp-h1
+