Added SerialVersionUID to OpenFoodFacts

Open Food Facts is an org which combines data science and food ingredients together to output a variety of user helpfull detailed view on products.
In the app of OFF you can add a product picture,Barcode, Details of ingredients
The app uses an OCR and stores the data in the OFF server.
It's open and readable to all . They accept Crowdin translations and are Open to internationalization.

Bug Fixes

#569
#781

The problem :

The problem was that there were Some warnings in the IDE for the classes which implements Serializable Interface.

Solution

There is need of an SerialVersionUID in every class which implements Serializable interface
Normally the compiler automatically creates this variable and puts a compiler generated value in it.

Describe briefly how you fixed the issue(s).

https://dzone.com/articles/what-is-serialversionuid?fromrel=true

https://javapapers.com/core-java/serialversionuid-in-java-serialization/

Linked pull requests

#736
#785
Here are some Articles i used to research for this problem.

• Technology Stack
  NodeJs For backend
  Android native app and ios native App

• How to contribute?
  Go to the Repository and pick some issues,
  Join the mailing list and chat on Slack