fix: add in README setup info for the auth token

README.md

@@ -11,3 +11,17 @@ is the bridge used to easy access Barclays APIs.
 
 During the hackaton contracts and states can be created in `contracts` module and flows can be
 created in the `workflows` module.
+
+## Getting started
+
+In order to operate with provided bridge functionalities, you should use the provided auth token for your team and set it as a system environment variable. (edited)
+
+To be able to use the bridge with the configured token `val AUTH_TOKEN: String = System.getenv("BARCLAYS_AUTH_TOKEN")`.
+
+In Linux you can set it into you `.profile` file under the home directory like that:
+
+`export BARCLAYS_AUTH_TOKEN="the-actual-token"`
+
+In Windows you can go through the menu to Environment Variable and set it from there.
+
+https://docs.oracle.com/en/database/oracle/machine-learning/oml4r/1.5.1/oread/creating-and-modifying-environment-variables-on-windows.html#GUID-DD6F9982-60D5-48F6-8270-A27EC53807D0