samples: add Terra samples

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

samples/Terra/quoteselect.t

@@ -0,0 +1,12 @@
+
+local a = {}
+
+local c = terralib.includec("stdio.h")
+
+b = `c.printf("hello\n")
+
+terra foo()
+	return b
+end
+
+foo()