Update README.md

Author: nestolen

README.md

@@ -1,5 +1,6 @@
 [![Build Status](https://travis-ci.com/learning-process/parallel_programming_course.svg?branch=master)](https://travis-ci.com/learning-process/parallel_programming_course)
 [![Build status](https://ci.appveyor.com/api/projects/status/t46nd9gyt7iirdy8/branch/master?svg=true)](https://ci.appveyor.com/project/allnes/parallel-programming-course/branch/master)
+![Build application](https://github.com/learning-process/parallel_programming_course/workflows/Build%20application/badge.svg?branch=master)
 
 # Parallel programming course