Update crates.io crates to point to up to date information about Solana development

[Woody4618]

Problem

For rust devs the first contact point with Solana is often Crates.io and the Solana crates there are very outdated or do not have any docs.
Agave
Solana

Proposed Solution

I think it would be great if the readme on the crates (Solana and Agave) would point to a place where people can get started with Solana rust development. Could just point to this repo for example or to the Solana docs.

[victorchukwuemeka]

i will like to work on this

[victorchukwuemeka]

fixed