Merge pull request raycast#59 from raycast/pr-template

Introduce template for PR

Author: PitNikola

.github/pull_request_template.md

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+## Description
+
+Please write a short summary for this change. If it's a new script command, explain what it does.
+
+## Type of change
+
+- [ ] New script command
+- [ ] Bug fix
+- [ ] Improvement of an existing script
+- [ ] Documentation update
+- [ ] Toolkit change
+- [ ] Other
+
+If you selected `Other`, please specify.
+
+## Screenshot
+
+If it's a new script command, please include a screenshot or a GIF of how it works.
+
+## Dependencies / Requirements
+
+If it's a new script command that requires some additional steps to make it work, please describe it here. E.g. requiring installation of another command line tool or requirement to specify username / API token / etc.