Add some docs

Public/New-ConfigurationPlaceHolder.ps1

@@ -1,4 +1,33 @@
 function New-ConfigurationPlaceHolder {
+    <#
+    .SYNOPSIS
+    Command helping define custom placeholders replacing content within a script or module during the build process.
+
+    .DESCRIPTION
+    Command helping define custom placeholders replacing content within a script or module during the build process.
+    It modifies only the content of the script or module (PSM1) and does not modify the sources.
+
+    .PARAMETER CustomReplacement
+    Hashtable array with custom placeholders to replace. Each hashtable must contain two keys: Find and Replace.
+
+    .PARAMETER Find
+    The string to find in the script or module content.
+
+    .PARAMETER Replace
+    The string to replace the Find string in the script or module content.
+
+    .EXAMPLE
+    New-ConfigurationPlaceHolder -Find '{CustomName}' -Replace 'SpecialCase'
+
+    .EXAMPLE
+    New-ConfigurationPlaceHolder -CustomReplacement @(
+        @{ Find = '{CustomName}'; Replace = 'SpecialCase' }
+        @{ Find = '{CustomVersion}'; Replace = '1.0.0' }
+    )
+
+    .NOTES
+    General notes
+    #>
     [CmdletBinding(DefaultParameterSetName = 'FindAndReplace')]
     param(
         [Parameter(Mandatory, ParameterSetName = 'CustomReplacement')][System.Collections.IDictionary[]] $CustomReplacement,