docs: add some notes for running tests (#194)

I run into some problems when running the tests locally. This PR adds
the way I solved those, for future contributors.

README.md

@@ -68,12 +68,25 @@ We are actively looking for contributors. Thank you for your interest. We have s
 
 To test locally :-
 
-You need `foundry`to successfully to run it.
+You need `foundry` to successfully to run it.
 
 ```bash
 cargo test
 ```
 
+On Mac, you might need to pull the foundry image manually specifying the platform with:
+
+```bash
+docker pull --platform amd64 foundry-rs/foundry
+```
+
+Sometimes the bindings fail due to containing botched doctests.
+You can exclude them from the test run with:
+
+```bash
+cargo test --workspace --exclude eigen-utils
+```
+
 At least 1 `approving` review is required to merge the PR.
 
 ### lint