Update README.md

README.md

@@ -2,10 +2,20 @@
 
 The leaderboard repo tracks solutions to [invrs-gym](https://github.com/invrs-io/gym) challenges.
 
+Solutions are the `params` which are passed to the `response` method of the component associated wit an gym challenge. They can be saved to json format by,
+
+```python
+from totypes import json_utils
+
+serialized = json_utils.json_from_pytree(params)
+with open("my_solution.json", "w") as f:
+  f.write(serialized)
+```
+
 ## How to contribute your solutions
 
 - Clone this repository
-- Add your solution to the appropriate directory, following the filename convention i.e. `challenges/{CHALLENGE_NAME}/solutions/{DATE}_{GITHUB_USERNAME}_{SOLUTION_ID}.json`
+- Add your solution to the appropriate directory, following the filename convention (e.g. `challenges/{CHALLENGE_NAME}/solutions/{YYMMDD}_{GITHUB_USERNAME}_{SOLUTION_ID}.json`)
 - Modify the `README.md` in the challenge directory to include your submission. Please link any publication or code that is relevant.
 - Run `python scripts/eval.py`, which will detect new designs and add them to the appropriate leaderboard files
 - Submit a PR for review