adding one main PR template for FEATURE/IMPROVEMENT/BUG FIX

.github/pull_request_template.md

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+<!--
+Thanks for submitting a pull request to Consul.NET! Please provide the following information to help us review and merge
+your changes effectively.
+ -->
+
+<!-- PR Title format
+Please use one of the following formats for the title of your pull request above:
+- [FEATURE]: <a one-liner summary of the changes>
+- [ENHANCEMENT]: <a one-liner summary of the changes>
+- [BUG FIX]: <a one-liner summary of the changes>
+-->
+
+## Description
+
+<!-- (required)
+A clear and concise description of the changes made in this pull request
+-->
+
+## Related Issues
+
+<!-- (optional)
+List any related issues, if applicable, using the format `#issue_number`
+Example: #123
+-->
+
+## Additional Context
+
+<!-- (optional)
+Add any additional context or information about this pull request
+-->
+
+## Checklist
+
+<!-- (required) -->
+Please make sure to check the following before submitting your pull request:
+
+- [ ] Did you read the [contributing guidelines](https://consuldot.net/docs/contributing/guidelines)?
+- [ ] Did you update the docs?
+- [ ] Did you write any tests to validate this change?