Add example for writing to target #147

Job	Run time
unix (5.1, ubuntu-latest)	1m 44s
windows (lua53, lua5.3, 5.3, /mingw64/include/lua5.3/)	2m 48s
windows (lua, lua, 5.4, /mingw64/include/)	2m 43s
unix (5.1, macos-latest)	1m 46s
unix (5.2, ubuntu-latest)	50s
windows (luajit, luajit, 5.1, /mingw64/include/luajit-2.1/)	2m 28s
unix (5.2, macos-latest)	1m 47s
unix (5.3, ubuntu-latest)	1m 0s
unix (5.3, macos-latest)	1m 48s
unix (5.4, ubuntu-latest)	1m 0s
unix (5.4, macos-latest)	1m 47s
unix (luajit-openresty, ubuntu-latest)	51s
unix (luajit-openresty, macos-latest)	1m 48s
	22m 20s

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