add readme

README.md

@@ -0,0 +1,12 @@
+# Password Helper
+
+ensuring secure password storage on the server side
+
+```js
+const password_helper = require('@scode/password-helper');
+
+const hash = await password_helper.hash('foo');
+
+await password_helper.verify(hash, 'foo'); // returns true;
+await password_helper.verify(hash, 'bar'); // returns false;
+```