samples: add Terra samples

source: https://github.com/zdevito/terra/tree/master/tests

samples/Terra/lvaluetreelist.t

@@ -0,0 +1,9 @@
+
+
+terra foobar()
+	var a = 4
+	@&[quote in a end] = 5
+	return a
+end
+
+assert(foobar() == 5)