function Add1d( mergedElements ) {

	// Add1d inherits from abstract strategy "StableMerge1d".

	StableMerge1d.call( this, mergedElements );

	this.strategyType = "Add1d";

}
Add1d, can be initialized by StrategyFactory directly.
MergeStrategy for MergedLayer when apply Add operation to 1d TensorSpace layers.

For example:
```javascript
let dense1 = new TSP.layers.Dense({ ...config });
let dense2 = new TSP.layers.Dense({ ...config });
let addLayer = TSP.layers.Add([ dense1, dense2 ], { ...config });
```
In this example, the merged layer "addLayer" apply merge strategy "Add1d".

@param mergedElements, array of TensorSpace layers. (layerList.length > 0)
@constructor