SYCLomatic README missing a pre-requisite and a Useful link

[mpanoop]

The pre-requisite section of the README document for SYCLomatic repo doesn't call out the CUDA headers dependency and versions supported (https://github.com/oneapi-src/SYCLomatic#prerequisites)

The post migration SYCL can be targeted for non-Intel devices as well but the useful links doesn't point to right articles which explains how to do this. Below are suggested links to link to:

1. Targeting nVIDIA GPUs - https://developer.codeplay.com/products/oneapi/nvidia/2023.2.1/guides/get-started-guide-nvidia#use-dpc-to-target-nvidia-gpus
2. Targeting AMD GPUs - https://developer.codeplay.com/products/oneapi/amd/2023.2.1/guides/get-started-guide-amd#use-dpc-to-target-amd-gpus

[mpanoop]

Building SYCLomatic from source doesn't need CUDA headers but using SYCLomatic to migrate the CUDA application to SYCL needs CUDA headers. Can we call this out explicitly in README?

[tomflinda]

@mpanoop thanks for your advice, we will plan to update the README file.