add onnxslim support

[inisis]

https://github.com/hacksider/Deep-Live-Cam/issues/198

Summary by Sourcery

Add support for onnxslim by updating the README.md with instructions on how to optimize the inswapper_128_fp16.onnx model.

Documentation:

• Update README.md to include instructions for optimizing the inswapper_128_fp16.onnx model using onnxslim.

[sourcery-ai[bot]]

Reviewer's Guide by Sourcery

This pull request adds support for optimizing the 'inswapper_128_fp16.onnx' model using the 'onnxslim' tool. The changes are implemented by updating the README.md file to include instructions on how to use 'onnxslim' for model optimization.

File-Level Changes

Files	Changes
README.md	Updated the README.md file to include instructions for optimizing the 'inswapper_128_fp16.onnx' model using 'onnxslim'.

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