Standardize README shield badges

[marcduiker]

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: dapr/community#355

These are the shield badges for the php-sdk repo.

Snippet to include in the README just below the title:

[![Build Status][actions-badge]][actions-url] [![License: Apache 2.0][license-badge]][license-url] [![Good First Issues][gfi-badge]][gfi-url] [![discord][discord-badge]][discord-url] [![YouTube][youtube-badge]][youtube-link] [![X/Twitter][x-badge]][x-link]

[license-badge]: https://img.shields.io/github/license/dapr/php-sdk?style=flat&label=License&logo=github
[license-url]: https://github.com/dapr/php-sdk/blob/master/LICENSE
[actions-badge]: https://img.shields.io/github/actions/workflow/status/dapr/php-sdk/.github%2Fworkflows%2Fphp.yml?branch=main&label=Build&logo=github
[actions-url]: https://github.com/dapr/php-sdk/actions/workflows/php.yml
[gfi-badge]:https://img.shields.io/github/issues-search/dapr/php-sdk?query=type%3Aissue%20is%3Aopen%20label%3A%22good%20first%20issue%22&label=Good%20first%20issues&style=flat&logo=github
[gfi-url]:https://github.com/dapr/php-sdk/issues?q=is%3Aissue+is%3Aopen+label%3A%22good+first+issue%22
[discord-badge]: https://img.shields.io/discord/778680217417809931?label=Discord&style=flat&logo=discord
[discord-url]: http://bit.ly/dapr-discord
[youtube-badge]:https://img.shields.io/youtube/channel/views/UCtpSQ9BLB_3EXdWAUQYwnRA?style=flat&label=YouTube%20views&logo=youtube
[youtube-link]:https://youtube.com/@daprdev
[x-badge]:https://img.shields.io/twitter/follow/daprdev?logo=x&style=flat
[x-link]: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.

@ maintainers: Please label this as good first issue.