samples: add Terra samples

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

samples/Terra/getmethod.t

@@ -0,0 +1,19 @@
+
+
+struct A {}
+
+
+A.metamethods.__getmethod = function(self,methodname)
+	local c = methodname:sub(1,1):byte()
+	return terra(a : &A)
+		return c
+	end
+end
+
+
+terra foo()
+	var a : A
+	return a:a() + a:b()
+end
+
+assert(foo() == ("a"):byte() + ("b"):byte())