docs(README): adding missing igb-textarea to components table

[kdinev]

Description

Motivation / Context

Type of Change (check all that apply):

• Bug fix
• New functionality
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• Refactoring (no functional changes)
• Documentation
• Demos
• CI/CD
• Tests
• Changelog

Component(s) / Area(s) Affected:

How Has This Been Tested?

• Unit tests
• Manual testing
• Automated e2e tests

Test Configuration:

• .NET version:
• Hosting model:
• Browser(s):
• OS:

Screenshots / Recordings

Checklist:

• All relevant tags have been applied to this PR
• This PR includes unit tests covering all the new code
• This PR includes API docs for newly added methods/properties
• This PR includes general feature table updates in the root README.MD
• This PR includes CHANGELOG.MD updates for newly added functionality
• This PR contains breaking changes
• This PR includes behavioral changes and the feature specification has been updated with them
• Accessibility (ARIA, keyboard navigation, focus management) has been verified

Closes #

[Copilot]

Copilot review overview

🟢 Approval recommended

The documented short name matches the existing template configuration.

Review effort: Balanced
Findings: None

What changed in this PR

Documents the existing igb-textarea item template in the available-components table.

Changes:

• Adds igb-textarea under Inputs.

File	Description
templates/​IgniteUI.Blazor.Templates/​README.md	Lists the text-area template short name.

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