Add current version of the backend into the ReadMe file:

    - This is the current used version since release v0.1.58:
        - https://github.com/duality-labs/duality-web-app/releases/tag/v0.1.58
        - #173

    - before that the FE was developed against an unreleased branch:
        - duality-labs/duality@0768dd5
        - #102

    - and before that the FE was developed against an Ethereum chain
      on a different unreleased prototype repository

README.md

@@ -2,6 +2,10 @@
 
 The code for the Duality front-end web app.
 
+This version of the front end is intended to work with release v0.1.0 of the backend:
+
+- https://github.com/duality-labs/duality/releases/tag/v0.1.0
+
 ## Setting up the dev environment
 
 To set up the front end locally, connected to the current online testnet: