inserts appname and qrcodenumber in the DB

assignment-db-service/prisma/schema.prisma

@@ -14,9 +14,10 @@ model assignments {
   programid      Int?
   studentname    String?
   snakegameid    String?
-  originalfile   String?
-  editablefile   String?
-  assignmenturl  String?
+  qrcodenumber   Int     @unique
+  appname        String  @unique
+  description    String?
   passwordhash   String?  // store bcrypt hash
+  assignmenturl  String?
   instructorid   Int?
 }