Add 'Category' metadata to calculator project idea

[Dippp10]

@florinpop17 ji, ## Description
Added a new metadata field called Category to the Calculator project idea in Projects/Tier1/calculator.md.

This field helps classify each project idea into a type (e.g., Utilities, Games, Productivity, API), making it easier for contributors and learners to browse projects by interest.

Changes Made

• Added Category: Utilities below the Tier line in Projects/Tier1/calculator.md.
• (Optional) Updated README.md to mention the new Category field.

Why This Change

• Improves organization of project ideas.
• Allows better filtering and discoverability of similar projects.
• Makes the repository more beginner-friendly.

Type of Change

• Enhancement
• Bug fix
• Documentation update

Checklist

• Added Category metadata to one project idea.
• Verified formatting and markdown consistency.
• Ready for review and feedback.

Summary by CodeRabbit

• Documentation
  • Updated Calculator App project title and description formatting.
  • Added category classification to the project documentation.

[coderabbitai]

Walkthrough

The PR updates the Calculator App markdown documentation by renaming the title from "Calculator" to "Calculator App", removing bold formatting from the "Tier:" label, and adding a new "Category: Utilities" metadata line.

Changes

Cohort / File(s)	Summary
Documentation metadata update Projects/1-Beginner/Calculator-App.md	Updated title to "Calculator App", changed "Tier:" formatting to plain "Tier:", and added "Category: Utilities" metadata field

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Possibly related issues

• Add “Project Category” metadata to each idea for better organization and filtering #1050: The addition of the "Category: Utilities" metadata line directly addresses the requested "Project Category" metadata field requirement.

Poem

🐰 A title refined, formatting set free,
Category labels for all eyes to see,
Small tweaks that make organization complete,
Metadata flourishes, tidy and neat!

Pre-merge checks and finishing touches

❌ Failed checks (1 warning)

Check name	Status	Explanation	Resolution
Docstring Coverage	⚠️ Warning	Docstring coverage is 0.00% which is insufficient. The required threshold is 80.00%.	You can run @coderabbitai generate docstrings to improve docstring coverage.

✅ Passed checks (2 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title Check	✅ Passed	The pull request title "Add 'Category' metadata to calculator project idea" directly corresponds to the primary change identified in the raw summary: adding a new line "Category: Utilities" to the calculator project file. The title is concise, specific, and clearly communicates the main objective stated in the PR description—introducing a new metadata field to improve project discoverability. A reviewer scanning the repository history would immediately understand that this PR adds a category classification feature to the calculator project idea. The title avoids vague language and accurately reflects the core intent of the changeset.

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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📜 Recent review details

Configuration used: CodeRabbit UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 9e8dd00 and 01f3b2b.

📒 Files selected for processing (1)

• Projects/1-Beginner/Calculator-App.md (1 hunks)

🔇 Additional comments (2)

Projects/1-Beginner/Calculator-App.md (2)

1-5: Metadata updates look good.

The title clarification (Calculator → Calculator App) improves specificity, and the removal of bold formatting from "Tier:" creates a consistent metadata pattern with the new "Category: Utilities" field. All changes are well-formatted and logically placed.

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1-5: Inconsistency: Category field only in one of 90 project files, and metadata formatting differs from standard.

The Category field was added only to Calculator-App.md but exists in no other project file out of 90 total. Additionally, this file uses plain Tier: 1-Beginner instead of the standard **Tier:** format used consistently across all other project files. README.md does not document the Category field.

Either add Category metadata consistently to all 90 project files and update formatting to **Tier:**, or document why this field is specific to Calculator-App. Update README.md accordingly to reflect any new metadata structure.

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[Dippp10]

@florinpop17 ji , do merge above pull request number 1051