Create pull_request_template.md

Author: dliubarskyi

.github/pull_request_template.md

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+<!--
+Thank you so much for your contribution!
+
+Please fill in all the sections below.
+Please open the PR as a draft initially. Once it is reviewed and approved, we will ask you to add documentation and examples.
+Please note that PRs with breaking changes or without tests will be rejected.
+
+Please note that PRs will be reviewed based on the priority of the issues they address.
+We ask for your patience. We are doing our best to review your PR as quickly as possible.
+Please refrain from pinging and asking when it will be reviewed. Thank you for understanding!
+-->
+
+## Issue
+<!-- Please specify the ID of the issue this PR is addressing. For example: "Closes #1234" or "Fixes #1234" -->
+Closes #
+
+## Change
+<!-- Please describe the changes you made. -->
+
+
+## General checklist
+<!-- Please double-check the following points and mark them like this: [X] -->
+- [ ] There are no breaking changes
+- [ ] I have added unit and/or integration tests for my change
+- [ ] The tests cover both positive and negative cases
+- [ ] I have manually run all the unit and integration tests in the module I have added/changed, and they are all green
+<!-- Before adding documentation and example(s) (below), please wait until the PR is reviewed and approved. -->
+- [ ] I have added/updated the [documentation](https://github.com/langchain4j/langchain4j/tree/main/docs/docs)
+- [ ] I have added an example in the [examples repo](https://github.com/langchain4j/langchain4j-examples) (only for "big" features)
+- [ ] I have added/updated [Spring Boot starter(s)](https://github.com/langchain4j/langchain4j-spring) (if applicable)
+
+
+## Checklist for adding new maven module
+<!-- Please double-check the following points and mark them like this: [X] -->
+- [ ] I have added my new module in the root `pom.xml`