sugar syntax to declaring views

**Do you want to request a *feature* or report a *bug*?**
feature

**What is the current behavior?**
a mongoose syntax to create views

**What is the expected behavior?**
a mongoose syntax to create views

it could be similar to mongoose.Schema

maybe

```jsx
mongoose.View({
name: '',
viewOn: '',
pipeline: [],
});
```

Start by reviewing the existing mongoose.Schema API and the proposed mongoose.View shape in the issue. Compare the requested name, viewOn, and pipeline fields with MongoDB view requirements, then define the public API and acceptance criteria before implementation.

Written by the indexing model from the issue text.