Add discussion in readme

[codecov[bot]]

Codecov Report

Base: 96.68% // Head: 96.68% // No change to project coverage :thumbsup:

Coverage data is based on head (2d79814) compared to base (a8d4abc). Patch has no changes to coverable lines.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #184 +/- ## ======================================= Coverage 96.68% 96.68% ======================================= Files 7 7 Lines 181 181 ======================================= Hits 175 175 Misses 6 6 ``` Help us with your feedback. Take ten seconds to tell us [how you rate us](https://about.codecov.io/nps?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaSmoothOptimizers). Have a feature suggestion? [Share it here.](https://app.codecov.io/gh/feedback/?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=JuliaSmoothOptimizers)

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[github-actions[bot]]

Package name	latest	stable
DCISolver.jl
JSOSolvers.jl
Percival.jl