feature: added file exists checker

pkg/io/files/file_exists_checker.go

@@ -0,0 +1,14 @@
+package files
+
+import (
+	"errors"
+	"os"
+)
+
+func IsFileExists(fileLocation string) bool {
+	if _, err := os.Stat(fileLocation); errors.Is(err, os.ErrNotExist) {
+		return false
+	}
+
+	return true
+}