[Meta] Estimate the engine's ELO rating

[dannyhammer]

Find out how to test the engine and find out it's ELO rating.
Then, streamline the process so that we can find out the ELO ratings of major releases.

[dannyhammer]

So far I've found three ways of doing this:

1. Manually test against different versions of stash-bot, since that engine has plenty of releases that span a wide Elo range.
2. Upload the bot to Lichess and have it play opponents, slowly growing in strength over time.
   • By the way, this is already done Integrate with Lichess #18
3. Have a release be tested and uploaded to the CCRL page(s)

[dannyhammer]

Toad is currently on the CCRL pages. Here's the Toad 1.0.0 page, where it's rated at 1777. Not bad.