Standardize README shield badges

We want to update the README for all Dapr repos so they all include shield badges for YouTube, Discord, X/Twitter and ensure they are all in the same style. See: https://github.com/dapr/community/issues/355

These are the [shield badges]( https://shields.io/badges) for the go-sdk repo.

 [](https://goreportcard.com/report/github.com/dapr/go-sdk) [](https://github.com/dapr/go-sdk/actions/workflows/release-on-tag.yaml) [](https://codecov.io/gh/dapr/go-sdk) [](https://github.com/dapr/go-sdk/blob/main/LICENSE) [](https://app.fossa.com/projects/custom%2B162%2Fgithub.com%2Fdapr%2Fgo-sdk?ref=badge_shield&issueType=license) [](https://github.com/dapr/go-sdk/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22) [](http://bit.ly/dapr-discord) [](https://youtube.com/@daprdev) [](https://twitter.com/daprdev)

Snippet to include in the README:

```
 [](https://goreportcard.com/report/github.com/dapr/go-sdk) [](https://github.com/dapr/go-sdk/actions/workflows/release-on-tag.yaml) [](https://codecov.io/gh/dapr/go-sdk) [](https://github.com/dapr/go-sdk/blob/main/LICENSE) [](https://app.fossa.com/projects/custom%2B162%2Fgithub.com%2Fdapr%2Fgo-sdk?ref=badge_shield&issueType=license) [](https://github.com/dapr/go-sdk/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22) [](http://bit.ly/dapr-discord) [](https://youtube.com/@daprdev) [](https://twitter.com/daprdev)
```

**Contributing**
- Comment `/assign` on this issue if you want to self-assign this issue and update the README.
- Don't forget to sign off your commit, for more details see [Developer Certificate of Origin (DCO) in the docs](https://docs.dapr.io/contributing/contributing-overview/#developer-certificate-of-origin-signing-your-work).

@ maintainers: Please label this as `good first issue`.