Opens the file for writing. This will either create the file
    if it doesn't exist or append to it if it does.
    
    - Namespace
- Statiq.Common 
- Containing Type
- IFile
Syntax
Stream OpenAppend(bool createDirectory = true)Parameters
| Name | Type | Description | 
|---|---|---|
| createDirectory | bool | Will create any needed directories that don't already exist if set to true. | 
Return Value
| Type | Description | 
|---|---|
| Stream | The stream. |