Add GitHub templates for issues and pull requests

[amulaj]

Description

This pull request adds standardized templates for bug reports, feature requests, and pull requests to the repository. These templates are designed to improve the quality and consistency of issue and PR submissions, making it easier for maintainers to triage and address contributions.

Changes

• Added a new bug report template (.github/ISSUE_TEMPLATE/bug_report.md) to guide users in providing clear and actionable bug reports.
• Added a new feature request template (.github/ISSUE_TEMPLATE/feature_request.md) to help users submit well-structured enhancement proposals.
• Added a new pull request template (.github/pull_request_template.md) to standardize the information provided when submitting pull requests.

Closes #121

[CLAassistant]

All committers have signed the CLA.

[Copilot]

Pull request overview

Adds GitHub contribution templates to standardize how users file issues and how contributors open pull requests, improving triage consistency across the repo.

Changes:

• Added a bug report issue template.
• Added a feature request issue template.
• Added a pull request template.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
.github/pull_request_template.md	Introduces a PR template with sections for description, changes, screenshots, and issue linkage.
.github/ISSUE_TEMPLATE/feature_request.md	Adds a structured template for proposing enhancements.
.github/ISSUE_TEMPLATE/bug_report.md	Adds a structured template for reporting bugs with repro steps and expected/actual behavior.

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[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

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[pri-kise]

Have you considered the new yaml syntax that is used e.g. for the BCApps repository?
Personally I prefer this one since, there you can't simple remove something during the issue creation.
https://github.com/microsoft/BCApps/blob/main/.github/ISSUE_TEMPLATE/bug_report.yaml?plain=1

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated 3 comments.

[Copilot]

Pull request overview

Copilot reviewed 3 out of 3 changed files in this pull request and generated no new comments.