Add Pull Request Template for UI team

.github/clients/ui/pull_request_template.md

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+<!--- If this is a non-code change, this template is not required; reference any issues or top-level descriptions as needed -->
+
+## Description
+<!--- Describe your changes in detail; the what, the why, any findings, etc -->
+<!--- Include any screenshots of changed UI; Include any gifs if it was a flow / UX change -->
+
+## How Has This Been Tested?
+<!--- Please describe in detail how you tested your changes. -->
+<!--- Include details of your testing environment, and the tests you ran to -->
+<!--- see how your change affects other areas of the code, etc. -->
+
+## Test Impact
+<!--- What tests have you done to covert implemented functionality -->
+<!--- If tests are not applicable, explain why here -->
+
+## Request review criteria
+<!--- This PR will be merged by any repository approver when it meets all the points in the checklist -->
+<!--- Go over all the following points, and put an `x` in all the boxes that apply. -->
+
+Self checklist (all need to be checked):
+
+- [ ] The developer has manually tested the changes and verified that the changes work.
+- [ ] Testing instructions have been added in the PR body (for PRs involving changes that are not immediately obvious).
+- [ ] The developer has added tests or explained why testing cannot be added.
+- [ ] Code changes follow the [kubeflow contribution guidelines](https://www.kubeflow.org/docs/about/contributing/).
+
+If you have UI changes
+
+<!--- You can ignore these if you are doing manifest, backend, internal logic, etc changes; aka non-UI / visual changes -->
+- [ ] Included any necessary screenshots or gifs if it was a UI change.
+- [ ] Verify that UI/UX changes conform the UX guidelines for Kubeflow.