Slackbuild added.

distro-packages/Slackware/README

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+Cthulhu is a screen reader for individuals who are blind or visually impaired,
+forked from Orca. It provides access to applications and toolkits that support
+the AT-SPI (e.g., the GNOME desktop).
+
+This screen reader helps users navigate their desktop environment and applications
+through speech synthesis and braille output.
+
+After installation, you can start Cthulhu through the GNOME desktop environment
+or by running 'cthulhu' from the command line.
+
+DEPENDENCIES:
+This package requires the following packages, all available from SlackBuilds.org:
+- at-spi2-core
+- brltty
+- gobject-introspection
+- gsettings-desktop-schemas
+- gstreamer
+- gst-plugins-base
+- gst-plugins-good
+- gtk3
+- liblouis
+- libpeas
+- libwnck3
+- python3-atspi
+- python3-cairo
+- python3-gobject
+- python3-setproctitle
+- speech-dispatcher