Add checks badge to README

Author: arunsathiya

README.md

@@ -1,7 +1,9 @@
+[![Checks](https://github.com/arunsathiya/adventofcode/actions/workflows/tests.yml/badge.svg)](https://github.com/arunsathiya/adventofcode/actions)
+
 # Advent Of Code
 
 My Advent Of Code solutions in golang.
 
 # How to run
 
-Navigate to each day folder and run `go run main.go`
+Navigate to each day folder and run `go run main.go`