added steel in Contributing.md

Author: heyAyushh

CONTRIBUTING.md

@@ -22,11 +22,11 @@ When contributing code examples, please follow these guidelines to ensure progra
 
 2. Anchor programs should be in directory `anchor`, programs written for Solana Native should be in directory `native`.
 
-3. Tests for Solana native and Anchor programs should be written with [ts-mocha](https://github.com/piotrwitek/ts-mocha).
+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 should be written with [solana-bankrun](https://kevinheavey.github.io/solana-bankrun)
+4. Tests for solana native programs and steel framework programs should be written with [solana-bankrun](https://kevinheavey.github.io/solana-bankrun)
 
-5. For Solana native programs ensure adding these mandatory pnpm run scripts to your `package.json`. file for successful ci/cd builds:
+5. For Solana native programs and Steel framework programs ensure adding these mandatory pnpm run scripts to your `package.json`. file for successful ci/cd builds:
 
 ```json
 "scripts": {