Incorrect example in README

[jatkinson1000]

Related to #56 The example code in the README is now incorrect as it has not incorporated the updates to use the layout argument in torch_tensor_from_blob()

We should either:

• Update it to use t_t_from_array()
• Update to add a layout argument

My preference is for the first (see discussion on #56).

However, this information should also be taken out of the README and placed in the longer form API docs now, perhaps as part of #53