Add Cohere with their Command R models

[PeterDaveHello]

Reference:

• https://cohere.com/command

Preview screenshot:

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Name	Status	Preview	Comments	Updated (UTC)
chatall	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Apr 23, 2024 11:52am

[PeterDaveHello]

@sunner your help with the logo image is really appreciate ;)

[sunner]

Since Command R+ has not a logo, I think the cohere logo is ok. The above .png is downloaded from https://brandfetch.com/cohere.com?library=default&collection=logos&asset=idKKlzRsYQ&view=overview and resized to 256x256

[PeterDaveHello]

@sunner, thanks; the PR is updated now. BTW would you take a look at https://github.com/sunner/ChatALL/pull/780#issuecomment-2044810373?