title: How to display data uploaded by different users in a general list through firebase
body: <p>I am making an app in which the user will authenticate themselves and store information, say related to food detail. Firebase will store this information corresponding to each userID. I want that whenever any user opens the app, he should see a list of all the food details uploaded by different users. I know only how to access data of the current user. Even for a particular user, i want to access a given field of all users present in Firebase realtime database.</p>