Readme .md: Markdown View/Edit

Readme .md is an offline document viewer and editor designed for technical documents, code files, and structured data formats. It provides native rendering for Markdown files, formatting tools for JSON and configuration files, and an integrated editor with live preview support.

Core Functionality

Markdown Rendering
- Full support for GitHub Flavored Markdown (GFM) specifications.
- Native rendering of formatted tables, interactive task checklists, strikethrough text, blockquotes, and fenced code blocks.
- In-document image rendering for local attachments and remote badges.
- Clickable external hyperlinks and internal anchor navigation.

Document Editing and Authoring
- Dual-mode workflow: switch between rendered view and raw text editor.
- Markdown editing toolbar for inserting headings (H1, H2), text emphasis (bold, italic), inline code, code fences, task lists, bullet points, blockquotes, and table templates.
- File creation support: start new files directly in Markdown (.md), JSON (.json), Plain Text (.txt), Python (.py), or YAML (.yaml).

Navigation and Search
- Table of Contents: automatically generates a structured outline based on document headings (H1 through H6) with smooth-scroll navigation.
- In-document search: real-time keyword matching with highlight indicators, active match counters, and previous/next navigation controls.

Structured Data and Code Viewing
- JSON Inspector: validates JSON syntax, formats minified payloads with two-space indentation, colorizes syntax elements, and supports one-tap copying of formatted output.
- Code syntax highlighting: colorized viewing for Python, JavaScript, TypeScript, Kotlin, Java, C, C++, C#, Go, Rust, SQL, Bash/Shell, and XML.
- Structured text formats: clean monospace viewing for YAML, TOML, INI, CSV, and log files.

Document Metrics and Analysis
- Computes character count, word count, total line count, and estimated reading time.
- Displays file metadata including file size and last modified attributes.

Customization and Typography
- Font size adjustment from 12sp to 28sp.
- Font family selection: System Default (Sans-serif), Serif, and Monospace.
- Line height controls: Compact, Normal, and Relaxed.
- Display themes: System Default, Light, Dark, and Pure Black (AMOLED).

Export and System Integration
- PDF Export: convert documents into formatted PDF files using Android's native Print framework.
- HTML Export: export standalone HTML files preserving styles and tables.
- System File Integration: registers intent filters to handle Open With actions from file managers, messaging applications, cloud drives, and web browsers.
- Storage Access Framework: reads and writes documents using Android scoped storage without requiring broad storage permissions.

Privacy and System Architecture
- Fully offline operation: files are processed locally on the device.
- No analytics SDKs, advertising frameworks, background services, or tracking mechanisms.
- Application download size is under 3 MB.

Supported File Formats
- Markdown: .md, .markdown, .mdown, .mkd
- Structured Data: .json, .yaml, .yml, .xml, .toml, .csv, .tsv
- Plain Text: .txt, .log, .nfo
- Source Code: .py, .js, .ts, .kt, .java, .c, .cpp, .cs, .sh, .bash, .sql, .dart, .go, .rs, .gradle