distro: Add Slackware Linux (#724)

Author: slackjeff

data/distro.yml

@@ -500,3 +500,23 @@
     <h2>Flatpak is installed by default on Salix since version 15.0—no setup required!</h2>
     <p>Flatpak comes preconfigured with the Flathub repository and desktop integration tools are included to allow 1-click install from Flathub.</p>
     <p>All you have to do is <a href="https://flathub.org/">install apps</a>!</p>
+
+- name: Slackware
+  logo: "slackware.svg"
+  steps:
+    - name: Install Flatpak
+      text: "
+        <p>A Flatpak package is available on SlackBuilds. To install it (assuming you use Sbopkg/sqg), first create the queuefile and run the following as root:</p>
+        <terminal-command>sqg -p flatpak</terminal-command>
+        <p>Then compile it. Load the queuefile, press 'Q', and wait:</p>
+        <terminal-command>sbopkg -i flatpak</terminal-command>"
+
+    - name: Add the Flathub repository
+      text: "
+        <p>Flathub is the best place to get Flatpak apps. To enable it, run:</p>
+        <terminal-command>flatpak remote-add --if-not-exists flathub https://dl.flathub.org/repo/flathub.flatpakrepo</terminal-command>"
+
+    - name: Restart
+      text: '
+        <p>To complete setup, restart your system. Now all you have to do is <a href="https://flathub.org/">install apps</a>!</p>
+        <p>Note: graphical installation of Flatpak apps may not be possible with Slackware.</p>'