Contribution Guidelines: Point 3 and 4 regarding testing Solana programs are not clear

[MohammedAlabd]

I didn't get these two points.

1. what should be used to write tests for programs written in Solana native, and steel?
2. what should be used to write tests for Poseidon and Seahorse programs?

program-examples/CONTRIBUTING.md

Lines 27 to 29 in 3a36468

	3. Tests for Solana native, Steel and Anchor programs should be written with [ts-mocha](https://github.com/piotrwitek/ts-mocha).
	4. Tests for Solana native programs and steel framework programs should be written with [solana-bankrun](https://kevinheavey.github.io/solana-bankrun)