Tutorial - add new network about deepreg HOT 6 CLOSED

this is not of priority for me for the moment, and it's part of doc also. i suggest to wait a bit? but ofc you can do it if you have time @YipengHu

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@YipengHu Yes I can write a draft using the affine network as an example and you can tell me what you think.

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for custom functionalities, i suggest to label them as post-r1

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this is a doc, which does not to be comprehensive. i think this is useful for user have an opportunity to contributing things

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@mathpluscode would you have time for this? if not, please assign this to me.

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@RemiDelaunay Do you think you have some time to write a short tutorial on how to add a new network? Juts use the affine you did for example? maybe similar to this one: https://github.com/DeepRegNet/DeepReg/blob/master/docs/tutorial_add_loss.md

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