README: add repo activity trends widget

[634750802]

Add activity trends widget to README

What problem does this PR solve?

No

What is changed and how it works?

Only updated README.md

Check List

Tests

• Unit test
• Integration test
• Manual test (add detailed scripts or steps below)
• No need to test

  • I checked and no code files have been changed.

Side effects

• Performance regression: Consumes more CPU
• Performance regression: Consumes more Memory
• Breaking backward compatibility

Documentation

• Affects user behaviors
• Contains syntax changes
• Contains variable changes
• Contains experimental features
• Changes MySQL compatibility

Release note

Please refer to Release Notes Language Style Guide to write a quality release note.

None

[sre-bot]

All committers have signed the CLA.

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[ti-chi-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hawkingrei, okJiang

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[ti-chi-bot]

[LGTM Timeline notifier]

Timeline:

• 2023-09-21 01:19:33.499938372 +0000 UTC m=+739539.467526422: ☑️ agreed by hawkingrei.
• 2023-09-21 02:43:06.407413023 +0000 UTC m=+744552.375001238: ☑️ agreed by okJiang.