Add OpenWhispr easy setup installer and companion files

Single-file bash installer (setup-openwhispr.sh) with distro detection,
dependency installation, STT/AI cleanup provider selection, API key
management, and first-run launch. Includes README, LICENSE (MIT),
CHANGELOG, .gitignore, ShellCheck CI, issue templates, PR template,
and GitHub setup guide.

https://claude.ai/code/session_01XKYC1basxdwtHy71tky7xm

CHANGELOG.md

@@ -0,0 +1,24 @@
+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/),
+and this project adheres to [Semantic Versioning](https://semver.org/).
+
+## [1.0.0] — 2026-03-25
+
+### Added
+
+- Single-file bash installer `setup-openwhispr.sh`
+- Automatic distro detection (Ubuntu, Debian, Mint, Fedora, openSUSE, Arch)
+- Architecture detection (amd64, arm64)
+- GitHub releases integration — fetches latest OpenWhispr automatically
+- Paste dependency detection (xdotool / kdotool / wtype / D-Bus)
+- STT provider selection: local Whisper/Parakeet, Groq, OpenAI Realtime
+- AI cleanup provider selection: OpenAI, Anthropic, Groq, Ollama, skip
+- Safe API key storage in `~/.bashrc` (never overwrites existing keys)
+- Idempotent — safe to re-run, skips already-installed versions
+- ShellCheck CI via GitHub Actions
+- README with cost table, privacy table, and one-command install
+- Issue templates for bug reports and distro compatibility reports
+- Pull request template