add readme

README.md

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+# Auth Client Helper
+
+a module to make logging in to servers using the auth-server-helper easier
+
+## Usage
+
+```js
+const client = require('@scode/auth-client-helper');
+
+// if using in the browser, will send a request to the current host
+const session_id = client.login('user','passw');
+
+// specify a host manually
+const session_id = client.login('user','passw','https://example.com');
+```