Add PR template

Author: clonker

.github/PULL_REQUEST_TEMPLATE.md

@@ -0,0 +1,22 @@
+## Description
+
+<!-- Describe the purpose of this PR. -->
+
+## Checklist
+- [ ] I have read the [contributing guidelines](https://docs.soliditylang.org/en/latest/contributing.html)
+- [ ] I have disclosed any use of AI tools in creating this PR (see AI Disclosure section below)
+- [ ] I have personally reviewed, understood, and tested every change in this PR
+
+## AI Disclosure
+<!--
+See our contributing guidelines for the full AI usage policy:
+https://docs.soliditylang.org/en/latest/contributing.html#ai-assisted-contributions
+
+If you used AI tools in any part of this PR you MUST disclose it below.
+Describe which tool(s) you used and for which parts.
+-->
+
+- [ ] No AI tools were used
+- [ ] AI tools were used (details below)
+
+<!-- If AI tools were used, describe which tools and for which parts here. -->