add context7.json to repo (#1421)

## Description

This pull request adds a new JSON file, `context7.json`, containing
configuration details such as a URL and a public key.

Configuration addition:

* Added `context7.json` file with `url` and `public_key` fields for
external service configuration.

## Documentation

Does this require changes to the WorkOS Docs? E.g. the [API
Reference](https://workos.com/docs/reference) or code snippets need
updates.

```
[ ] Yes
```

If yes, link a related docs PR and add a docs maintainer as a reviewer.
Their approval is required.