chore: prepare release v1.2.0

[vaceslav]

Summary

Prepare for v1.2.0 release with TextTemplateProcessor feature.

Changes

• Update version from 1.0.0 to 1.2.0
• Update package description to mention plain text template support
• Add email and text-templates tags
• Update release notes

What's New in v1.2.0

• TextTemplateProcessor: Process plain text templates (emails, notifications, SMS) using the same template syntax as Word documents
• Same powerful features: placeholders, conditionals, loops, nested structures
• Comprehensive documentation and 23+ tests
• 100% backward compatible

Release Notes

Added TextTemplateProcessor for email and plain text templating using the same template syntax as Word documents.

[Copilot]

Pull request overview

This PR prepares version 1.2.0 of Templify by updating package metadata to reflect the addition of TextTemplateProcessor, a new feature that brings the same powerful template syntax to plain text processing (emails, notifications, SMS).

Key Changes:

• Version bumped from 1.0.0 to 1.2.0
• Package description expanded to mention plain text template support alongside Word documents
• Added email and text-templates tags to improve discoverability

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[Copilot]

The version update appears to be incorrect. The diff shows updating from 1.0.0 to 1.2.0, but according to CHANGELOG.md, version 1.1.0 was already released on 2025-12-02. The previous version in the .csproj file should be 1.1.0, not 1.0.0. This suggests the diff context may be misleading, or the version wasn't updated for the 1.1.0 release. Please verify that the actual current version in the file is 1.1.0 before this change.