Add a recipe for runner.

Summary: Improved "open with" suggestions for dired mode in Emacs. This
  library links a set of shell commands to file or directory names.
  These commands can then be used in dired mode using
  dired-do-shell-command (by pressing “!”). Since this library modifies
  the behavior of dired-guess-shell-alist-user, the command syntax will
  follow that variable’s syntax (see the documentation of
  dired-guess-shell-alist-user for more).

Association with package: I like the package a lot

Link to package repository: https://github.com/thamer/runner

Communication with package maintainer: none, the package was already ready.

Tests: the package builds and installs properly
Merge pull request #1108 from DamienCassou/recipe-runner

Add a recipe for runner.