Added app icon for readme

Author: ankanSikdar

README.md

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+<img src='screenshots/icon.png' width='85px'/>
+
 # Expense Tracker
 
-A Flutter App with which you can track your daily expenditures. 
+A Flutter App with which you can track your daily expenditures.
 It shows a Real-Time Weekly Bar Graph of the tracked Expenditures.
 You can also delete an added expenditure.
 
 # Run The App on Your Android Device Now
+
 Download the APK from here
 [Click Here To Go To The Downloads Page](https://github.com/ankanSikdar/flutter-expense-tracker/releases/ "Releases Page")
 
 ## Screenshots
-<img src="screenshots/ss1.png" width = 250> <img src="screenshots/ss2.png" width = 250> <img src="screenshots/ss3.png" width = 250> <img src="screenshots/ss4.png" width = 250> <img src="screenshots/ss5.png" width = 250> <img src="screenshots/ss6.png" width = 250> <img src="screenshots/ss7.png" width = 250> <img src="screenshots/ss8.png" width = 250>
 
+<img src="screenshots/ss1.png" width = 250> <img src="screenshots/ss2.png" width = 250> <img src="screenshots/ss3.png" width = 250> <img src="screenshots/ss4.png" width = 250> <img src="screenshots/ss5.png" width = 250> <img src="screenshots/ss6.png" width = 250> <img src="screenshots/ss7.png" width = 250> <img src="screenshots/ss8.png" width = 250>
 
 ## Getting Started