Adds dependency example and information

internal/creator/templates/pack_metadata.hcl

@@ -11,5 +11,15 @@ pack {
 
 // dependency "demo_dep" {
 //   alias  = "demo_dep"
-//   source = "git://source.git/packs/demo_dependency_pack"
+//   source = "git://source.git/packs/demo_dep"
 // }
+
+// Declared dependencies will be downloaded from their source
+// using "nomad-pack vendor deps" and added to ./deps directory.
+
+// Dependencies in active development can by symlinked in
+// the ./deps directory
+
+// Example dependency source values:
+// - "git::https://github.com/org-name/repo-name.git//packs/demo_dep"
+// - "[email protected]:org-name/repo-name.git/packs/demo_dep"