Add Pull Request Template for UI team

[lucferbux]

Description

Following github's pull request template instructions, allow custom PR Template for UI contributions.

By default the common PR Template would appear, with a link to the UI one.

How Has This Been Tested?

Merge criteria:

• The commits and have meaningful messages; the author will squash them after approval or will ask to merge with squash.
• Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
• The developer has manually tested the changes and verified that the changes work

[lucferbux]

@ederign @tarilabs I've tested this in other repo to make sure it works, however I haven't been able to do that here.
I'm not even sure if this is a good flow, let me know your thoughts, I'm opening the PR to start a discussion.

[tarilabs]

/lgtm

but how about "merging" the UI-related points into a section in the existing pull request template?

[tarilabs]

btw @lucferbux can you kindly signoff your commit for DCO check, please?

https://wiki.linuxfoundation.org/dco

[lucferbux]

but how about "merging" the UI-related points into a section in the existing pull req

Yeah I'm sorry, I'm changing computers and I didn't have signoff enabled by default, thanks

[lucferbux]

/lgtm

but how about "merging" the UI-related points into a section in the existing pull request template?

I don't mind that either, what do you think, @ederign ?

[Griffin-Sullivan]

Yeah I would suggest since there's so much overlap with the normal template that we add a UI only section at the bottom for additional criteria.

[ederign]

Before reading this thread, I just suggested the same here -> #298 (comment)

+1 to have a single template.

[tarilabs]

thanks @lucferbux , see below minor suggestions

[ederign]

Thank you @lucferbux !

[tarilabs]

/lgtm

thanks Lucas, will wait for another to go in then proceeding for merge.

[google-oss-prow]

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