Adding instructions for use of open router

[zigabrencic]

As discussed in Issue 1099 adding the support for Open Router and models there.

Good news. LLama3 8B is much better then LLama 2 70 B was :)

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 70.57%. Comparing base (a0794bf) to head (1356f9d).

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1139   +/-   ##
=======================================
  Coverage   70.57%   70.57%           
=======================================
  Files          31       31           
  Lines        1733     1733           
=======================================
  Hits         1223     1223           
  Misses        510      510           

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

[viborc]

Hey, community! ❤️
We'd love to get your help and insights on this PR. If any of you use OpenRouter and are willing to give this a spin and test it, we'd highly appreciate that! Feel free to follow @zigabrencic's instructions in this PR, and let us know if this works well or if you encounter any issues!

[TheoMcCabe]

tested this and can confirm it works - merging now. thanks @zigabrencic