Stack Add Icon
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## Icon Request

* Icon name: StackAdd
* Tags of this icon: stack, add
* Use case: add something to the stack
* Screenshots of similar icons:
<img width="126" alt="image" src="https://github.com/Remix-Design/RemixIcon/assets/900311/1ae9a578-fd7f-4a96-8360-12fae6b7915d">
<img width="449" alt="image" src="https://github.com/Remix-Design/RemixIcon/assets/900311/dbdd6e4b-52a8-43ce-ae7c-a40df324fb2e">

