add PR template and style guide

Author: Kuncheria-KV

PULL_REQUEST_TEMPLATE.md

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+<!-- Thank you for contributing to @keyvaluesystems/react-multi-selection-ui-component! -->
+<!-- Before submitting a pull request, please review our contributing guidelines. -->
+
+​
+
+## Pull Request Checklist
+
+​
+
+- [ ] **Read the contributing guidelines.**
+- [ ] **Linked to an issue:** Fixes # (replace with the issue number, if applicable)
+- [ ] **Branch is up-to-date with the base branch:** `master`
+- [ ] **Changes pass tests locally:** `npm test` or `yarn test`
+- [ ] **Documentation has been updated, if necessary**
+- [ ] **Code follows the style guide of the project**
+      ​
+
+## Description
+
+​
+
+<!-- Provide a brief description of your changes. -->
+
+​
+
+## Screenshots (if applicable)
+
+​
+
+<!-- Add screenshots or GIFs to help explain your changes. -->
+
+​
+
+## Additional Notes
+
+​
+
+<!-- Any additional information you want to provide that is not covered by the checklist or description. -->
+
+​
+
+## Related Issues or PRs
+
+​
+
+<!-- If your pull request is related to any issue(s) or other pull request(s), mention them here. -->
+
+​
+
+## Reviewer Guidelines
+
+​
+
+<!-- Suggest specific areas of the codebase that you would like the reviewer to focus on. -->
+
+​
+
+## Testing Instructions
+
+​
+
+<!-- Provide step-by-step instructions on how to test your changes. -->
+
+​
+
+## Checklist for Reviewers
+
+​
+
+- [ ] Code follows project conventions and style
+- [ ] Changes do not introduce new warnings or errors
+- [ ] Unit tests cover the changes
+- [ ] Documentation is updated
+      ​
+
+## By submitting this pull request, I confirm that my contribution is made under the terms of the MIT License.

STYLE_GUIDELINES.md

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+## SCSS Style Guidelines for @keyvaluesystems/react-multi-selection-ui-component
+
+**Introduction**
+
+As an open-source project utilizing SCSS, @keyvaluesystems/react-multi-selection-ui-component strives to maintain a consistent and well-structured codebase. These SCSS style guidelines serve as a reference for contributors, ensuring that their SCSS code adheres to established conventions and best practices.
+
+**SCSS Coding Conventions**
+
+- Organize SCSS files into a logical structure.
+- Use meaningful and descriptive names for variables, mixins, and classes.
+- Use SCSS nesting judiciously to organize complex styles.
+- Include comments to explain non-obvious logic and complex styles.
+- Utilize SCSS variables to define reusable values.
+- Employ a SCSS linting tool.
+- Should support devices with all resolutions
+- Follow CamelCase conventions for class names that concisely convey their purpose, enhancing code organization and readability
+- Adhere to the practice of reusing style classes to improve code organization and maintainability.
+
+**Documentation Practices**
+
+- Provide clear documentation for exported mixins and variables.
+- Include a README file within the SCSS directory if necessary.
+- Add comments to SCSS files.