Function create

create(x?, y?): Float64Array
Creates a Vec2; may be called with x, y, z to set initial values.

Note: Since passing in a raw JavaScript array is valid in all circumstances, if you want to force a JavaScript array into a Vec2's specified type it would be faster to use
```
const v = vec2.clone(someJSArray);
```
Parameters
- x: number = 0
  Initial x value.
- y: number = 0
  Initial y value.
Returns Float64Array
the created vector