Create pull_request_template.md

.github/pull_request_template.md

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+Thank you for your contribution!  Before sending this Pull Request, please confirm the following:
+
+* [ ] You have read [the contributing guidelines](https://github.com/edent/SuperTinyIcons/blob/master/CONTRIBUTING.md)
+* [ ] The icon's size is *under* 1,024 Bytes
+* [ ] The layout of the SVG looks like this including newlines
+```svg
+<svg xmlns="http://www.w3.org/2000/svg"
+aria-label="..." role="img"
+viewBox="0 0 512 512"><path
+d="m0 0H512V512H0"
+fill="#fff"/> ... </svg>
+```
+
+If you have done the above, please send the Pull Request.