add examples

[Nitish-bot]

Currently there are no examples that consume our ts and rs clients. Besides being good practice and a help for developers, they could also act as tests not for the program but our sdks, right?

We have the webapp but it's not a small contained example that you'd scroll through.

Also side note: I think it would be helpful to have a section in the README on the rust sdk as well alongside the ts one.

[dev-jodee]

There's an example in our templates repository solana-foundation/templates@45b7459

If you have other things you think are missing you can open a pr and I can look if it fits