samples: add Terra samples

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

samples/Terra/lvaluepointer.t

@@ -0,0 +1,10 @@
+
+
+terra foo()
+	var a : int = 5
+	var pa = &a
+	@pa = 4
+	@[&float](pa) = 5
+end
+
+foo()