Add GitHub issues and pull request templates

[tomvothecoder]

Adding GitHub templates for issues and issues will streamline the process of opening and managing them.

Examples:

• https://github.com/tomvothecoder/python-template-repo/issues/new/choose

Use:

• https://github.com/tomvothecoder/python-template-repo/tree/main/.github/ISSUE_TEMPLATE
• https://github.com/tomvothecoder/python-template-repo/blob/main/.github/pull_request_template.md