samples: add Terra samples

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

samples/Terra/arrptr.t

@@ -0,0 +1,5 @@
+a = &int[4]
+a = (&int)[4]
+local test = require("test")
+test.eq(false,a:ispointer())
+test.eq(true,a:isarray())