samples: add Terra samples

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

samples/Terra/objc.t

@@ -0,0 +1,25 @@
+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 OC = require("lib/objc")
+
+terra main()
+	OC.NSAutoreleasePool:new()
+	var str = OC.NSString:stringWithUTF8String("the number of hacks is overwhelming...")
+	var err = OC.NSError:errorWithDomain_code_userInfo(str,12,nil)
+	var alert = OC.NSAlert:alertWithError(err)
+
+	var imgname = OC.NSString:stringWithUTF8String("foo.png")
+	var img = OC.NSImage:alloc():initByReferencingFile(imgname)
+	alert:setIcon(img)
+	alert:runModal()
+end
+
+terralib.saveobj("objc",{main = main}, { "-framework", "Foundation", "-framework", "Cocoa" })
+
+end