update readme

README.md

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-# src
+# Flutter JWT Auth
 
-A new Flutter project.
+This project showcases a simple implementation of JWT auth in Flutter.
+
+A detailed explanation of the implementation can be found on bettercoding.dev.
+
+## Server
+
+This project provides a simple test server that implements basic JWT auth endpoints.
+See https://github.com/bettercoding-dev/shelf-jwt-test-server for more details.
+
+To start the server in this project, simple run:
+
+```shell
+dart server/shelf-jwt-test-server/bin/server.dart
+```
+
+## Follow-Along
+
+If you want to implement certain parts of the project yourself to improve your coding skills, you can
+check out the `follow-along` branch.
+
+```shell
+git checkout follow-along
+```
+
+In this branch, I removed certain parts of the implementation, and you can code it yourself with the help of the
+tutorial.