[Good 1st issue] adding zread badge for kepler projects

[SamYuan1990]

I knew it's very easy and you may think I am lazy. But I want to open this chance for people who wanna to join CNCF by a PR contribution, learn and benefit.

By this chance, you will go through PR process. :-)

Here is the specific approach to make content change.

1. go to https://zread.ai/sustainable-computing-io/kepler, click add a badge.
2. copy the badge markdown and added to kepler reademe file.

• kepler
• kepler-operator

[SMC242]

Hi there, thank you for creating this issue. I have implemented the changes with the following PRs:

• kepler: docs: #2334 add zread badge #2340
• kepler-operator: #635