samples: add Terra samples

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

samples/Terra/testrequire.t

@@ -0,0 +1,14 @@
+local f = assert(io.popen("uname", 'r'))
+local s = assert(f:read('*a'))
+f:close()
+
+if s~="Darwin\n" then
+  print("Warning, not running test b/c this isn't a mac")
+else
+
+local A = require("lib.objc")
+local B = require("lib.objc")
+
+assert(A == B)
+
+end