Added cmdlet and alias names to manifest to enable auto-loading of this module

[Masterxilo]

It is required that a module manifest file specifies the cmdlets and aliases that the module will create once loaded in order for auto loading of modules in powershell to load the module as soon as one of its commandlets is called.

c.f. for example https://github.com/thoemmi/7Zip4Powershell/blob/master/7Zip4Powershell/7Zip4Powershell.psd1

This change will make Install.ps1 unnecessary and the users will not have to modify their $profile or call import-module explicitly.