Add justfile support (#713)

Co-authored-by: Adam Stankiewicz <sheerun@sher.pl>

packages.yaml

@@ -5593,6 +5593,14 @@ filetypes:
   - pattern: '*sway/config'
     description: Sway Configuration
 ---
+name: just
+remote: NoahTheDuke/vim-just
+filetypes:
+- name: just
+  patterns:
+  - pattern: 'justfile,*.just'
+    description: 'Just a task runner (https://github.com/casey/just)'
+---
 name: nftables
 remote: nfnty/vim-nftables
 filetypes:
@@ -5609,4 +5617,4 @@ filetypes:
 - name: openscad
   patterns:
   - pattern: '*.scad'
-    description: OpenSCAD 3D modeling language
+    description: OpenSCAD 3D modeling language