DOCSP-35980: Insert One usage example

[norareidy]

Adds a usage example showing how to insert a document.
JIRA - https://jira.mongodb.org/browse/DOCSP-35980
Staging - https://preview-mongodbnorareidy.gatsbyjs.io/laravel/DOCSP-35980-staging/usage-examples/insertOne/

Checklist

• Add tests and ensure they pass
• Add an entry to the CHANGELOG.md file
• Update documentation for new features

[rustagir]

lgtm with a few comments!

[rustagir]

Suggested change

	You can insert a document into a collection by calling the ``create()`` method on
	an Eloquent model or on a query builder.
	You can insert a document into a collection by calling the ``create()`` method on
	an Eloquent model or query builder.

[rustagir]

Suggested change

	For instructions on editing your Laravel application to run the usage example, see the
	:ref:`Usage Example landing page <laravel-usage-examples>`.
	To learn how to edit your Laravel application to run the usage example, see the
	:ref:`Usage Example landing page <laravel-usage-examples>`.

[rustagir]

Q: will this be merged only after write operations is merged? Link is broken as of now

[norareidy]

Yeah I'll wait until after write operations is merged

[GromNaN]

This example could be completed by the more expressive form (if anyone need to update the $movie model before saving):

$movie = new Movie([
    'title' => 'Marriage Story',
    'year' => 2019,
    'runtime' => 136,
]);
$movie->save();

[ccho-mongodb]

@GromNaN Would you recommend replacing the create() example with one that shows save()? If save() seems more common and helpful, we could update the example to show that method of inserting a single document instead.

[GromNaN]

No, Movie::create([...]) is the most common way to create a model.

There is also Movie::createOrFirst() that can be used (using findOneAndUpdate with upsert)

[GromNaN]

LGTM as this.