Feature - Add more models

[mrspence]

Right now we only have 1 model of one size, let's add 2 other sizes!

• 300M LFM2.5
• 700M LFM2.5
• 1.2B (we've already got)
• 3B... family to be decided
• 7B for the big boys!

[Avtrkrb]

@mrspence @will-lamerton
Do checkout https://huggingface.co/Avtrkrb/models !