Set default user agent

[airowe]

Description

Sets a default user agent that identifies network requests from this SPM

Type of Change

• Bug Fix
• New Feature
• Documentation

Checklist:

• My code follows the ATProtoKit API Design Guidelines as well as the Swift API Design Guidelines.
• I have performed a self-review of my own code and commented it, particularly in hard-to-understand areas.
• I have made corresponding changes to the documentation.
• My changes generate no new warnings or errors in the compiler or runtime.
• My code is able to build and run on my machine.

Screenshots (if applicable)

Attach any screenshots or GIFs showcasing the changes effect.

Additional Notes

We could add a method for users to update with their own custom user agent down the line, but they can update the ['User-Agent'] header currently if they so desire.

Credits

If you want to be credited in the CONTRIBUTORS file, you can fill out the form below. Please don't remove the square brackets.

• Name: [Adam Rowe]
• GitHub: [airowe]
• Bluesky: [airowe@bsky.social]
• Email: [adaminsley@gmail.com]

[MasterJ93]

I'm approving this, but I'm going to push it to 0.21.0.