Add pull request template

Author: devcrocod

.github/pull_request_template.md

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+## Description
+
+(Briefly describe the changes you made)
+
+## Type of change
+
+- [ ] Adding a new library descriptor
+- [ ] Fixing an error in an existing descriptor
+- [ ] Updating an outdated descriptor
+- [ ] Updating the library version
+
+## Checklist for new descriptors (remove if not applicable):
+
+- [ ] **Description and link** — Ensure that the `description` field accurately describes the library and that the `link` points to the current repository.
+- [ ] **Properties** — The `properties` field contains all versions of Maven dependecies used in the `dependencies` section.
+- [ ] **Dependencies** — The dependencies listed in the `dependencies` section use version variables correctly.
+- [ ] **Renders (if applicable)** — If the library includes classes for visualization, the `renderers` section has appropriate rendering rules.
+- [ ] **Testing** — Ensure that the descriptor works correctly in a Kotlin notebook.
+
+
+> Please note that we reserve the right to decline PRs that add new library descriptors base on considerations of quality, stability, or long-term support.