samples: add Terra samples

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

samples/Terra/luabridge.t

@@ -0,0 +1,18 @@
+struct A { a : int, b : double }
+
+terra foo(a : A)
+	return a.a + a.b
+end
+
+
+terra foo2(a : A)
+	return a.a + a.b,a.a
+end
+
+local test = require("test")
+
+test.eq( foo( {a = 1,b = 2.3} ), 3.3 )
+test.eq( foo( {1,2.3} ), 3.3 )
+test.eq( foo( {b = 1, a = 2.3} ),3 )
+
+test.meq({3.3,1},foo2( { a = 1, b = 2.3} ))