add channel-pruning MIT license

[ethanhe42]

Hi, thanks for the awesome work and for implementing Channel Pruning.

I'm the first author of the Channel Pruning paper (Channel Pruning for Accelerating Very Deep Neural Networks)

As my project is licensed under the MIT License, I have created this pull request to ensure compliance with the license terms.

In this PR,

• I have Included attribution comments at the top of the relevant source files that use or modify code from my project.
• Updated the doc to mention the original technical paper.

Thank you for your attention to this matter.

[CLAassistant]

All committers have signed the CLA.

[paddle-bot[bot]]

Automatically closed by Paddle-bot.