prepareData method with few data. Only for showing blog

prepareData method

private ArrayList<Subject> prepareData() {
    ArrayList<Subject> subjects = new ArrayList<Subject>();

    Subject physics = new Subject();
    physics.id = 1;
    physics.subjectName = "Physics";
    physics.chapters = new ArrayList<Chapter>();

    Chapter chapter1 = new Chapter();
    chapter1.id = 1;
    chapter1.chapterName = "Atomic power";
    chapter1.imageUrl = "http://ashishkudale.com/images/phy/atoms.png";

    Chapter chapter2 = new Chapter();
    chapter2.id = 2;
    chapter2.chapterName = "Theory of relativity";
    chapter2.imageUrl = "http://ashishkudale.com/images/phy/sigma.png";
    
    physics.chapters.add(chapter1);
    physics.chapters.add(chapter2);
    
    subjects.add(physics);

    return subjects;
}