Add util

util/file/file.go

@@ -0,0 +1,15 @@
+package file
+
+import "os"
+
+// Exists returns true if the path is existing
+func Exists(path string) (bool, error) {
+	_, err := os.Stat(path)
+	if err == nil {
+		return true, nil
+	}
+	if os.IsNotExist(err) {
+		return false, nil
+	}
+	return true, err
+}