settings: add VideosLink parameter

settings/settings.go

@@ -24,6 +24,8 @@ type FICSettings struct {
 	Title			string    `json:"title"`
 	// Authors is the group name of people making the challenge.
 	Authors			string    `json:"authors"`
+	// VideoLink is the link to explaination videos when the challenge is over.
+	VideosLink		string    `json:"videoslink"`
 
 	// Start is the departure time (expected or effective).
 	Start			time.Time `json:"start"`