docs: add Cardano node troubleshooting instructions for macOS users

Author: dlachaume

mithril-test-lab/mithril-end-to-end/README.md

@@ -94,6 +94,20 @@ cp $HOME/.local/bin/cardano-cli mithril-test-lab/mithril-devnet/cardano-cli
 ./mithril-end-to-end -vvv --db-directory db/ --bin-directory ../../target/release --skip-cardano-bin-download
 ```
 
+#### Troubleshoot Cardano node timeout errors
+
+Sometimes, the default parameter values used to run the end to end test may not be suitable for macOS environments, causing the following error:
+
+```bash
+>>>> Timeout: node-pool1 has not enough immutable files within 100 attempts
+```
+
+In this case, you can add `--cardano-slot-length 0.25` to the run command:
+
+```bash
+./mithril-end-to-end -vvv --work-directory db/ --bin-directory ../../target/release --devnet-scripts-directory=../mithril-devnet --cardano-slot-length 0.25
+```
+
 ## Build and run an aggregator stress test
 
 ```bash