add an example: linear-regression-square-root-loss

[Mamba413]

@Everglow00 ，thx!. Just a kind remind: have you check the documentation works well on you desktop following the guide below: https://skscope.readthedocs.io/en/latest/contribute/ContributeDocs.html#example-contribution-procedure

[Everglow00]

@Everglow00 ，thx!. Just a kind remind: have you check the documentation works well on you desktop following the guide below: https://skscope.readthedocs.io/en/latest/contribute/ContributeDocs.html#example-contribution-procedure

Thank you very much for your reminder. I have updated the local skscope library and made further modifications to the code of the example. I have followed the guide and made the necessary changes in the local environment, and I have uploaded the modified version.