Add PR template, contributing and code of conduct files (#879)

* Create pull_request_template.md

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* Update CONTRIBUTING.md

.github/pull_request_template.md

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+# **Name of PR**
+
+Type of pull request:
+- [ ] Bug fix
+- [ ] Feature
+- [ ] Other
+
+## Description:
+
+[Provide a brief description of the changes introduced by this pull request.]
+
+## Related Issues:
+
+[Reference any related issues that this pull request addresses or closes. Use the syntax `Closes #issue_number` to automatically close the linked issue upon merging.]
+
+## Checklist:
+
+- [ ] I have read and followed the [contribution guidelines](/CONTRIBUTING.md).
+- [ ] I have added necessary documentation (if applicable).
+- [ ] The changes pass all existing tests.
+
+## Screenshots/logs (if applicable):

CODE_OF_CONDUCT.md

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+# Code of Conduct
+
+## Our Pledge
+
+We as members, contributors, and leaders pledge to make participation in our
+community a harassment-free experience for everyone, regardless of age, body
+size, visible or invisible disability, ethnicity, sex characteristics, gender
+identity and expression, level of experience, education, socio-economic status,
+nationality, personal appearance, race, religion, or sexual identity
+and orientation.
+
+We pledge to act and interact in ways that contribute to an open, welcoming,
+diverse, inclusive, and healthy community.
+
+## Our Standards
+
+Examples of behavior that contributes to a positive environment for our
+community include:
+
+* Demonstrating empathy and kindness toward other people
+* Being respectful of differing opinions, viewpoints, and experiences
+* Giving and gracefully accepting constructive feedback
+* Accepting responsibility and apologizing to those affected by our mistakes,
+  and learning from the experience
+* Focusing on what is best not just for us as individuals, but for the
+  overall community
+
+Examples of unacceptable behavior include:
+
+* The use of sexualized language or imagery, and sexual attention or
+  advances of any kind
+* Trolling, insulting or derogatory comments, and personal or political attacks
+* Public or private harassment
+* Publishing others' private information, such as a physical or email
+  address, without their explicit permission
+* Other conduct which could reasonably be considered inappropriate in a
+  professional setting
+
+## Our Responsibilities
+
+Community leaders are responsible for clarifying and enforcing our standards of
+acceptable behavior and will take appropriate and fair corrective action in
+response to any behavior that they deem inappropriate, threatening, offensive,
+or harmful.
+
+Community leaders have the right and responsibility to remove, edit, or reject
+comments, commits, code, wiki edits, issues, and other contributions that are
+not aligned to this Code of Conduct, and will communicate reasons for moderation
+decisions when appropriate.
+
+## Enforcement
+
+Instances of abusive, harassing, or otherwise unacceptable behavior may be
+reported to the community leaders responsible for enforcement.
+All complaints will be reviewed and investigated promptly and fairly.
+
+All community leaders are obligated to respect the privacy and security of the
+reporter of any incident.
+
+## Attribution
+
+This Code of Conduct is adapted from the [Contributor Covenant](https://www.contributor-covenant.org), version 2.0, available at https://www.contributor-covenant.org/version/2/0/code_of_conduct.html
+
+For answers to common questions about this code of conduct, see https://www.contributor-covenant.org/faq

CONTRIBUTING.md

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+# Contributing to lichess-bot
+
+We welcome your contributions! There are multiple ways to contribute.
+
+## Table of Contents
+
+1. [Code of Conduct](#code-of-conduct)
+2. [How to Contribute](#how-to-contribute)
+3. [Reporting Bugs](#reporting-bugs)
+4. [Requesting Features](#requesting-features)
+5. [Submitting Pull Requests](#submitting-pull-requests)
+6. [Testing](#testing)
+7. [Documentation](#documentation)
+
+## Code of Conduct
+
+Please review our [Code of Conduct](/CODE_OF_CONDUCT.md) before participating in our community. We want all contributors to feel welcome and to foster an open and inclusive environment.
+
+## How to Contribute
+
+We welcome contributions in the form of bug reports, feature requests, code changes, and documentation improvements. Here's how you can contribute:
+
+- Fork the repository to your GitHub account.
+- Create a new branch for your feature or bug fix.
+- Make your changes and commit them with a clear and concise commit message.
+- Push your changes to your branch.
+- Submit a pull request to the main repository.
+
+Please follow our [Pull Request Template](.github/pull_request_template.md) when submitting a pull request.
+
+## Reporting Bugs
+
+If you find a bug, please open an issue with a detailed description of the problem. Include information about your environment and steps to reproduce the issue.
+When filing a bug remember that the better written the bug is, the more likely it is to be fixed.
+Please follow our [Bug Report Template](.github/ISSUE_TEMPLATE/bug_report.md) when submitting a pull request.
+
+## Requesting Features
+
+We encourage you to open an issue to propose new features or improvements. Please provide as much detail as possible about your suggestion.
+Please follow our [Feature Request Template](.github/ISSUE_TEMPLATE/feature_request.md) when submitting a pull request.
+
+## Submitting Pull Requests
+
+When submitting a pull request, please ensure the following:
+
+- You have added or updated relevant documentation.
+- Tests (if applicable) have been added or updated.
+- Your branch is up-to-date with the main repository.
+- The pull request title and description are clear and concise.
+
+## Testing
+
+Ensure that your changes pass all existing tests and consider adding new tests if applicable.
+
+## Documentation
+
+Improvements to the documentation are always welcome. If you find areas that need clarification or additional information, please submit a pull request.