Add pull request template about flint

[Tlazypanda]

Hey @Patamap I have opened a sample PR template here #52 We can modify it according to your input 🎉

[Patamap]

@Tlazypanda what do you suggest the detail for the pull request template?

[Patamap]

@Tlazypanda @gmajan @leitchy @malfrancis
can we have a similar pull request labels, as well as issues and the detail, is more towards to coding?

Topics: Feature title in the environment?
Detail:
Description: Please include a summary of the change and which issue is fixed. Please also include relevant motivation and context. List any dependencies that are required for this change.

How Has This Been Tested?
Unit test <Y/N>
E2E test <Y/N>
Please describe the tests that you ran to verify your changes. Please also note any relevant details for your test configuration.

Checklist:
My code follows the style guidelines of this project
I have performed a self-review of my own code
I have commented my code, particularly in hard-to-understand areas
I have made corresponding changes to the documentation
My changes generate no new warnings
Any dependent changes have been merged and published in downstream modules

@mentions of the person or team responsible for reviewing proposed changes.

[Tlazypanda]

Closed #51 via #52 (closing this since merged)