Update CONTRIBUTING.md

[trusktr]

Summary

This is a small change to mention pull request templates in CONTRIBUTING.md, and to show what the new template look likes.

What kind of change does this PR introduce?

Docs

For any code change,

• Related documentation has been updated if needed
• Related tests have been updated or tests have been added

Does this PR introduce a breaking change? (check one)

• Yes
• No

If yes, please describe the impact and migration path for existing applications:

Related issue, if any:

Tested in the following browsers:

• Chrome
• Firefox
• Safari
• Edge
• IE

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[trusktr]

Hmm, it still feels a bit noisy. 🤔

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[sy-records]

We can merge these two

What kind of change does this PR introduce? and Does this PR introduce a breaking change? (check one)

Can this be removed and a comment added to the Summary?

Related issue, if any: