TMP Add Ruby example skeleton

examples/basic.rb

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+require "gir_ffi"
+
+GirFFI.setup :SweGlib
+
+SweGlib.init
+
+timestamp = SweGlib::Timestamp.new
+timestamp.set_gregorian_full(1983, 3, 7, 11, 54, 45, 0, 1)
+
+moment = SweGlib::Moment.new
+
+moment.set_timestamp(timestamp)
+moment.set_coordinates(19.03991, 47.49801, 280)
+moment.set_house_system :placidus
+moment.add_all_planets
+
+all_planets = moment.get_all_planets()
+
+all_planets.each do |planet|
+  # TODO Why do I get numbers here, instead of GswePlanets?
+  print planet, "\n"
+end