[Doc] Coverage badge added

README.md

@@ -1,6 +1,6 @@
 # receqif
 
 
-[![Build Status](https://github.com/rayslava/receqif/workflows/CI%20Build/badge.svg)](https://github.com/rayslava/receqif/actions?query=workflow%3A%22CI+Build%22)
+[![Build Status](https://github.com/rayslava/receqif/workflows/CI%20Build/badge.svg)](https://github.com/rayslava/receqif/actions?query=workflow%3A%22CI+Build%22)[![codecov](https://codecov.io/gh/rayslava/receqif/branch/master/graph/badge.svg?token=4PINB65Z3N)](https://codecov.io/gh/rayslava/receqif)
 
 Receipt to QIF coverter in rust.