feat: initial release of transcode.sh v1.0.0

Batch transcode helper for media files using ffmpeg. Encoding parameters
are supplied by user-defined preset files (shell snippets that set an
`ffargs` array) stored under
${XDG_CONFIG_HOME:-$HOME/.config}/transcode.sh/presets/.

Key capabilities:
- Probes input codec and pixel format via ffprobe; derives an output
  pixel format that preserves chroma subsampling and bit depth.
- Per-user and per-invocation codec skip lists to leave already-encoded
  files untouched.
- Atomic in-place replacement: encodes to a temp file in the same
  directory, then renames on success.
- --only-if-smaller: discard the result if it is larger than the
  original.
- --saving: append filename, original/new sizes and percentage saved to
  a log file after each successful encode.
- --dry-run, --verbose, --quiet, --nice and --continue flags.
- Respects the NO_COLOR standard.
- Script hardening: strict PATH, safe IFS, errtrace, nounset, pipefail.

Also included:
- Man page (transcode.sh.1)
- Bash completion script (transcode.sh.bash-completion)
- README.md
- .gitmessage commit message template

License: BSD-3-Clause

1 files changed, 204 insertions, 0 deletions

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+# Created by https://www.toptal.com/developers/gitignore/api/windows,linux,macos,zsh,fish,vim,emacs,git
+# Edit at https://www.toptal.com/developers/gitignore?templates=windows,linux,macos,zsh,fish,vim,emacs,git
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