Write an Android application

I would like to design an app similar to the app called Trivia Crack. The project design is as follows: [login to view URL] application: 1. It is to be downloaded to the phones (both android & IOS) 2. it is competition of knowledge check 3. The user signs up using is facebook account only 4. The user will get a question with multiple choice answers and he has to choose the correct answer 5. If he gets a correct answer he is given another question 6. If he does not get the correct answer he stops, and gets the number of points for the correct answers that he answered 7. The user can choose the topic of the questions that he will be asked 8. The app should be downloadable from Play store and Google Aps etc [login to view URL] network: 1. The user can compete against an individual 2. The user should be able to see his/her friends that have the application (based on the friends from facebook that the user has) 3. The user can create a group and invite other users to join his group 4. The user should be able to join more than one group [login to view URL]: 1. Ranking for the users based on the correct answers that they got 2. Ranking of groups of users based on their correct answer points D. Back end: 1. A website should be developed that can be accessed by the administrator only 2. The administrator should be able to add and edit the list of questions 3. The administrator should be able to make different 'topics' of the questions (approx 10-20 groups)