Gets a cache path by combining it with the root path and cache path.
    
    - Namespace
 - Statiq
.Common  - Containing Type
 - I
Read Only File System Extensions  
Syntax
public static NormalizedPath GetCachePath(this IReadOnlyFileSystem fileSystem, in NormalizedPath path)
		Parameters
| Name | Type | Description | 
|---|---|---|
| fileSystem | IReadOnlyFileSystem | The file system. | 
| path | NormalizedPath | The path to combine with the root path and cache path.
    If this is Null, returns the root path combined with the cache path. | 
						
Return Value
| Type | Description | 
|---|---|
| NormalizedPath | The cache path. |