Making a Filled Rectangle with specific RGB Colors at 4 Corners and Middle

Hello Experts,

I am trying to get this done since last few days but could not Sad , finally thought of seeking help from you all.

Ok here is the problem, I need a rectangle see attached file with different RGB colors at all four corners and also middle. I have mentioned the RGB on the image.

your guidance will be highly appreciated,

Best Regards,

Sam