Create a feature flag
Create a feature flag with the given name, key, and variations.
<details>
<summary>Click to expand instructions for <strong>creating a migration flag</strong></summary>
### Creating a migration flag
When you create a migration flag, the variations are pre-determined based on the number of stages in the migration.
To create a migration flag, omit the `variations` and `defaults` information. Instead, provide a `purpose` of `migration`, and `migrationSettings`. If you create a migration flag with six stages, `contextKind` is required. Otherwise, it should be omitted.
Here's an example:
```json
{
"key": "flag-key-123",
"purpose": "migration",
"migrationSettings": {
"stageCount": 6,
"contextKind": "account"
}
}
```
To learn more, read [Migration Flags](https://launchdarkly.com/docs/home/flags/migration).
</details>
