docs: README

README.md

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+<!--
+SPDX-FileCopyrightText: 2023 Dyne.org foundation
+
+SPDX-License-Identifier: AGPL-3.0-or-later
+-->
+
+# zenflows-fabaccess
+
+Interface between [interfacer-gui](https://github.com/interfacerproject/interfacer-gui) and
+[FabAccess BFFH](https://gitlab.com/fabinfra/fabaccess/bffh) using the 
+[python bindings](https://gitlab.com/fabinfra/fabaccess/pyfabapi) that verify the extistence
+of a DID for the user using [did.dyne.org](explorer.did.dyne.org).
+
+## Configuration
+
+The configuration is done by providing environment variables.
+
+Here is the list of them:
+
+* `FAB_HOST` - hostname MQTT server
+* `FAB_PORT` - port of MQTT server
+* `FAB_USER` - valid username for bffh
+* `FAB_USER` - valid password for bffh
+* `DID_URL` - url for the DID controller
+* `DELTA_TIMESTAMP` - how long is a request valid (in seconds)
+
+## Examples
+
+See the subdirectory `example/`.