#5 Add contribution guidelines

Author: MPogotsky

.github/ISSUE_TEMPLATE/bug-report.yml

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+name: Bug Report
+description: Report a bug
+labels: ["bug"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for taking the time to fill out this bug report!
+  - type: dropdown
+    id: version
+    attributes:
+      label: Version of xapi-cpp 
+      description: In which version of xapi-cpp did this bug occur?
+      options:
+        - v1.0.1
+        - v1.0.0
+      default: 0
+    validations:
+      required: true
+  - type: textarea
+    id: operating-system
+    attributes:
+      label: Operating system used 
+      description: On which operating system and version did you encounter this bug?
+      placeholder: e.g., Windows 10, macOS Ventura, Ubuntu 20.04
+    validations:
+      required: true
+  - type: textarea
+    id: steps
+    attributes:
+      label: Steps to reproduce
+      description: Detailed steps on how to trigger the bug
+      placeholder: please provide descrition, code snippets and so on
+    validations:
+      required: true
+  - type: textarea
+    id: expected
+    attributes:
+      label: Expected Behavior
+      placeholder: I expected this to happen
+  - type: textarea
+    id: error-logs
+    attributes:
+      label: Put here any logs (optional)
+  - type: dropdown
+    id: assign
+    attributes:
+      label: "Would you like to work on this issue?"
+      options:
+        - "Yes"
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for reporting this issue! We will get back to you as soon as possible.

.github/ISSUE_TEMPLATE/config.yml

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+blank_issues_enabled: true

.github/ISSUE_TEMPLATE/new-feature.yml

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+name: New feature
+description: Suggest or request a new feature
+labels: ["enhancement"]
+body:
+  - type: markdown
+    attributes:
+      value: |
+        Please fill out the sections below to properly describe the new feature you are suggesting.
+  - type: textarea
+    id: description
+    attributes:
+      label: Describe the feature
+      placeholder: A button in the screen X that allows to do Y
+    validations:
+      required: true
+  - type: textarea
+    id: rationale
+    attributes:
+      label: It should be implemented because
+      placeholder: It will allow to do Y that is needed for Z
+  - type: textarea
+    id: context
+    attributes:
+      label: Additional context
+      placeholder: |
+        Add any other context or screenshots about the feature request here.
+  - type: dropdown
+    id: assign
+    attributes:
+      label: "Would you like to work on this issue?"
+      options:
+        - "Yes"
+  - type: markdown
+    attributes:
+      value: |
+        Thanks for your suggestion! Let's see together if it can be implemented.

CONTRIBUTING.md

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+# Contributing to xapi-cpp
+Thank you for your interest in contributing to **xapi-cpp**!
+This document outlines the guidelines for contributing, making it a smooth and collaborative experience for everyone.
+
+## How Can I Contribute?
+
+To report a bug, request a new feature, or contribute code, please use GitHub issues with the provided issue templates. You can open a new issue [here](https://github.com/MPogotsky/xapi-cpp/issues).
+
+## Contributing Workflow
+
+1. **Fork the repository**
+2. **Clone the repository**
+3. **Create a new branch**
+
+    Create a new branch for your changes. Use a descriptive branch name.
+    ```
+     git checkout -b <branch-name>
+    ```
+
+4. **Make your changes**
+
+    Implement your changes in the codebase. This might involve adding new features, fixing bugs, or improving documentation.
+
+5. **Test your changes!**
+
+    Thoroughly test your changes to ensure they work as expected and don't introduce any regressions. Refer to our Testing Guidelines for specific instructions.
+
+6. **Commit and push your changes**
+
+    Stage your changes and commit them with a clear and concise commit message.
+    
+    If you are solving issue from issue list, please, start you commit with #\<issue number\>.
+
+    Then, push your branch to your forked repository.
+    ```
+     git add .
+     git commit -m "#<issue number> Fix commit message"
+     git push origin <branch-name>
+    ```
+7. **Create a pull request to master branch**
+
+    Create a pull request targeting the ```main``` branch.
+
+8. **Wait for the pull request to be reviewed and merged**
+
+    Your pull request will be reviewed by project maintainers.  Address any feedback or requested changes.  Once approved, your pull request will be merged into the main branch.  
+    
+    Thank you for your contribution!
+
+
+## Contact
+Feel free to reach out via email at matsvei.pahotski@gmail.com if you need direct assistance.