Standardize README landing page

Author: MariusStorhaug

README.md

@@ -1,2 +1,27 @@
 # PowerShellGallery
-Module for interacting with the PowerShell Gallery
+
+PowerShellGallery is a PowerShell module for interacting with the PowerShell Gallery.
+
+## Installation
+
+Install the module from the PowerShell Gallery:
+
+```powershell
+Install-PSResource -Name PowerShellGallery
+Import-Module -Name PowerShellGallery
+```
+
+## Documentation
+
+Documentation is published at [psmodule.io/PowerShellGallery](https://psmodule.io/PowerShellGallery/).
+
+Use PowerShell help and command discovery for module details:
+
+```powershell
+Get-Command -Module PowerShellGallery
+Get-Help <CommandName> -Examples
+```
+
+## Contributing
+
+Issues and pull requests are welcome. Please use the repository issue tracker to report bugs, request features, or discuss improvements.