Add implementation documentation for Svedit

[Copilot]

Created comprehensive documentation to guide developers implementing Svedit in their applications.

Documentation Structure

Added 6 guides in docs/ directory (~8,400 words total):

• README.md - Documentation hub with quick reference, architecture diagram, and common patterns
• getting-started.md - Installation, setup, and first editable document walkthrough
• schema-guide.md - Schema definition, property types, serialization format, and validation
• document-api.md - Document/Transaction APIs, undo/redo, reactive state, and CRUD operations
• selection-system.md - Text/node/property selections, cursor control, and annotation handling
• custom-components.md - Building node components, using built-in components, edit/view modes

Key Coverage

Each guide includes:

• Working code examples for every concept
• Common implementation patterns (add paragraph, delete selection, toggle annotation, etc.)
• Edge cases and contenteditable gotchas
• Cross-references between related topics

Quick reference example from documentation:

// Define schema
const schema = define_document_schema({
  page: {
    kind: 'document',
    properties: {
      body: { type: 'node_array', node_types: ['paragraph'] }
    }
  },
  paragraph: {
    kind: 'text',
    properties: {
      content: { type: 'annotated_text', allow_newlines: true }
    }
  }
});

// Create document
const doc = new Document(schema, data, { config });

// Render
<Svedit {doc} path={[doc.document_id]} bind:editable />

Documentation follows a progressive learning path from basic setup to advanced patterns like shared content nodes and dynamic layouts.

Original prompt

Can you please create docs for how to implement svedit . please add it to a dir named docs
Just one or a few .md files will do

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Pull Request Overview

This PR adds comprehensive implementation documentation for Svedit, providing developers with detailed guides for integrating the library into their Svelte applications. The documentation covers all essential aspects from initial setup through advanced patterns, presented in a progressive learning structure.

Key additions:

• Six markdown guides totaling ~8,400 words of detailed documentation
• Complete API reference with working code examples
• Architecture diagrams and quick reference tables
• Progressive learning path from basic setup to advanced patterns

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
docs/README.md	Documentation hub with navigation, quick reference, architecture overview, and troubleshooting guide
docs/getting-started.md	Installation guide, basic concepts, first document setup, and development workflow
docs/schema-guide.md	Schema definition syntax, property types, serialization format, and best practices
docs/document-api.md	Document class API, transaction system, undo/redo, and common CRUD patterns
docs/selection-system.md	Selection types, cursor control, annotation handling, and advanced selection patterns
docs/custom-components.md	Component creation guide, built-in components, user input handling, and styling patterns

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[Copilot]

[nitpick] Comments suggest backwards selection but have confusing wording. Consider: 'Selection starts here' and 'Selection ends here' for clarity.

Suggested change

	anchor_offset: 10, // Ends here
	focus_offset: 5 // Starts here
	anchor_offset: 10, // Selection ends here
	focus_offset: 5 // Selection starts here