samples: add Terra samples

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

samples/Terra/pointerlike.t

@@ -0,0 +1,7 @@
+
+terra foo()
+    var a : int[4]
+    var b : &int = a
+    return a + 1, a - a, b - a, a - b, 1 + a 
+end
+foo()