updated activity answer

Author: sulavtimsina

README.md

@@ -777,13 +777,15 @@ The permissions that the app needs in order to access protected parts of the sys
 If we're using Android Studio to build your app, the manifest file is created for us, and most of the essential manifest elements are added as we build our app (especially when using code templates).
 
 * What is `Application` class?
- It is the Base class for maintaining global application state. We can provide our own implementation by creating a subclass and specifying the fully-qualified name of this subclass as the "android:name" attribute in your AndroidManifest.xml's <application> tag. The Application class, or your subclass of the Application class, is instantiated before any other class when the process for your application/package is created.
+  - It is the Base class for maintaining global application state. We can provide our own implementation by creating a subclass and specifying the fully-qualified name of this subclass as the "android:name" attribute in your AndroidManifest.xml's <application> tag. The Application class, or your subclass of the Application class, is instantiated before any other class when the process for your application/package is created.
 
 #### Activity
 
 * What is `Activity`?
-
-* Explain `Activity` and `Fragment` lifecycle. (Complete diagram [GitHub](https://github.com/xxv/android-lifecycle), simplified diagram for [Activity](https://developer.android.com/guide/components/activities/activity-lifecycle.html#alc), [Fragment](https://developer.android.com/guide/components/fragments.html#Lifecycle))
+  - An `Activity` is a single, focused thing that the user can do. Almost all activities interact with the user, so the `Activity` class takes care of creating a window for you in which you can place your UI with setContentView(View). While activities are often presented to the user as full-screen windows, they can also be used in other ways: as floating windows (via a theme with R.attr.windowIsFloating set), Multi-Window mode or embedded into other windows. 
+	
+* Explain `Activity` and `Fragment` lifecycle. 
+  - (Complete diagram [GitHub](https://github.com/xxv/android-lifecycle), simplified diagram for [Activity](https://developer.android.com/guide/components/activities/activity-lifecycle.html#alc), [Fragment](https://developer.android.com/guide/components/fragments.html#Lifecycle))
 
 * What are "launch modes"? [Mindorks](https://blog.mindorks.com/android-activity-launchmode-explained-cbc6cf996802)