samples: add Terra samples

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

samples/Terra/gettype.t

@@ -0,0 +1,18 @@
+
+
+
+function makestuff(a)
+	local T = a:gettype()
+	local struct ST {
+		a : T
+	}
+	return `ST { a }
+end
+
+makestuff = macro(makestuff)
+
+terra useit()
+	return makestuff(true).a,makestuff(3.0).a
+end
+local test = require("test")
+test.meq({true,3},useit())