Add Intelisence

[soderlind]

This pull request adds a new IntelliSense completion feature for WordPress readme section headings, updates documentation to reflect this enhancement, and bumps the extension version to 0.1.3. The new completion provider helps users quickly insert valid section headers by typing == followed by a space, improving usability and reducing formatting errors.

Feature: Section Heading IntelliSense

• Added a completion provider in src/extension.ts that suggests valid WordPress readme section headings (e.g., Description, Installation, FAQ) when the user types == at the start of a line. This ensures correct section formatting and streamlines editing.

Documentation Updates

• Updated README.md to mention the new Section Heading IntelliSense feature.
• Updated CHANGELOG.md to document the addition of the section heading IntelliSense completion provider and added a comparison link for version 0.1.3. [1] [2]

Versioning

• Bumped the extension version from 0.1.1 to 0.1.3 in package.json.

Extension Integration

• Registered the new completion provider in the extension activation logic.