🩹 [Patch]: Added placeholder functions (#3)

## Description

- Added placeholder functions

## Type of change

<!-- Use the check-boxes [x] on the options that are relevant. -->

- [ ] 📖 [Docs]
- [ ] 🪲 [Fix]
- [x] 🩹 [Patch]
- [ ] ⚠️ [Security fix]
- [ ] 🚀 [Feature]
- [ ] 🌟 [Breaking change]

## Checklist

<!-- Use the check-boxes [x] on the options that are relevant. -->

- [x] I have performed a self-review of my own code
- [x] I have commented my code, particularly in hard-to-understand areas

Author: MariusStorhaug

src/PowerShellGallery/private/Update-PSGalleryResourceListing.ps1

@@ -0,0 +1,39 @@
+function Update-PSGalleryResourceListing {
+    <#
+        .SYNOPSIS
+        Updates the listing status of a module on the PowerShell Gallery.
+
+        .EXAMPLE
+        Update-PSGalleryResourceListing -Name 'MyModule' -Version '1.0.0' -Listed $true -APIKey 'myapikey'
+    #>
+    [CmdletBinding(SupportsShouldProcess)]
+    param (
+        # Name of the module.
+        [Parameter(Mandatory)]
+        [string] $Name,
+
+        # Version of the module.
+        [Parameter(Mandatory)]
+        [string] $Version,
+
+        # Whether the module is listed on the PowerShell Gallery.
+        [Parameter(Mandatory)]
+        [bool] $Listed,
+
+        # API key for the PowerShell Gallery.
+        [Parameter(Mandatory)]
+        [string] $APIKey
+    )
+
+    $uri = "https://www.powershellgallery.com/packages/$Name/$Version/UpdateListed"
+
+    $body = @{
+        __RequestVerificationToken = $APIKey
+        Version                    = $Version
+        Listed                     = $Listed
+    }
+
+    if ($PSCmdlet.ShouldProcess("module [$Name]", 'Update listing status')) {
+        Invoke-RestMethod -Uri $uri -Method Post -Body $body
+    }
+}

src/PowerShellGallery/public/Get-PSGalleryAPI.ps1

@@ -6,5 +6,5 @@
     [CmdletBinding()]
     param()
 
-    Invoke-RestMethod -Method Get -Uri https://www.powershellgallery.com/api/v2/ -ContentType 'application/json'
+    Invoke-RestMethod -Method Get -Uri 'https://www.powershellgallery.com/api/v2/' -ContentType 'application/json'
 }

src/PowerShellGallery/public/Get-PSGalleryResource.ps1

@@ -0,0 +1,34 @@
+function Get-PSGalleryResource {
+    <#
+    .SYNOPSIS
+    Get a resource from the PowerShell Gallery.
+
+    .DESCRIPTION
+    Long description
+
+    .EXAMPLE
+    Get-PSGalleryResource -Name 'MyModule' -Version '1.0.0'
+
+    .NOTES
+    General notes
+    #>
+
+    [CmdletBinding()]
+    param (
+        # Name of the module.
+        [Parameter(Mandatory)]
+        [string] $Name,
+
+        # The API key for the PowerShell Gallery.
+        [Parameter(Mandatory)]
+        [string] $APIKey
+    )
+
+    $uri = "https://www.powershellgallery.com/packages/$Name"
+
+    $body = @{
+        __RequestVerificationToken = $APIKey
+    }
+
+    Invoke-RestMethod -Uri $uri -Method Get -Body $body
+}