Added "Exists" function

README.md

@@ -1,6 +1,8 @@
 golang-vfstemplate
 =======================
 
+Golang library for parsing template files from virtual http filesystem (httpfs)
+
 ## Installation
 
 ```

util.go

@@ -45,3 +45,13 @@ func ReadFileString(fs http.FileSystem, path string) (string, error) {
 	}
 	return string(buf), nil
 }
+
+// Exists reports whether the named file or directory exists in http.FileSystem.
+func Exists(fs http.FileSystem, name string) bool {
+	if _, err := Stat(fs, name); err != nil {
+		if os.IsNotExist(err) {
+			return false
+		}
+	}
+	return true
+}