Create PULL_REQUEST_TEMPLATE.md

PULL_REQUEST_TEMPLATE.md

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+# Pull Request checklist
+
+* [ ] I am contributing single HTML file, no folders, no any other external files even icons or images. - [Image CDN](https://placehold.co/)
+* [ ] My HTML is 100% valid - [HTML Validator](https://validator.w3.org/#validate_by_input)
+* [ ] My code is semantic (HTML/CSS/JS)
+* [ ] I preferred native elements than external libraries/packages
+* [ ] I used meaningful class names
+* [ ] The elements, properties or APIs I used have sufficient browser support, required by the task I worked on
+* [ ] My code is performant
+* [ ] My code follows the general best practices in web development and the style guidelines of this project