Add pull request template

.github/PULL_REQUEST_TEMPLATE.md

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+#### :tophat: What? Why?
+*Please describe your pull request.*
+
+#### :pushpin: Related Issues
+*Link your PR to an issue*
+- Related to #?
+- Fixes #?
+
+#### Testing
+*Describe the best way to test or validate your PR.*
+
+#### :clipboard: Checklist
+⚠️  No tests suites for now ⚠️
+:rotating_light: Please review the [guidelines for contributing](https://github.com/decidim/decidim/blob/develop/CONTRIBUTING.adoc) to this repository.
+
+- [ ] :question: ~~**CONSIDER** adding a unit test if your PR resolves an issue.~~
+- [ ] :heavy_check_mark: **DO** check open PR's to avoid duplicates.
+- [ ] :heavy_check_mark: **DO** keep pull requests small so they can be easily reviewed.
+- [ ] :heavy_check_mark: **DO** build locally before pushing.
+- [ ] :heavy_check_mark: ~~**DO** make sure tests pass.~~
+- [ ] :heavy_check_mark: ~~**DO** add CHANGELOG upgrade notes if required.~~
+- [ ] :x:~~**AVOID** breaking the continuous integration build.~~
+- [ ] :x:**AVOID** making significant changes to the overall architecture.
+
+### :camera: Screenshots
+*Please add screenshots of the changes you're proposing*
+![Description](URL)
+
+:hearts: Thank you!