Initial implemenatation of parameter completion

Author: FehintolaObafemi

src/Authentication/Authentication/custom/Find-MgGraphPermission.ps1

@@ -224,3 +224,32 @@ function Find-MgGraphPermission {
     end {
     }
 }
+
+$scriptblock = {
+    param($commandName,
+    $parameterName,
+    $wordToComplete,
+    $commandAst,
+    $fakeBoundParameters
+    )
+
+    $permissions = @()
+    $permissionsData = Permissions_GetPermissionsData
+    $permissionsOAuthQuery = Permissions_GetOauthData $permissionsData
+    $permissionsAppRolesQuery = Permissions_GetAppRolesData $permissionsData
+    $permissions += $permissionsOAuthQuery.Name
+    $permissions += $permissionsAppRolesQuery.Name
+    $permissions | Where-Object {
+        $_ -like "$wordToComplete*"
+    } | ForEach-Object {
+        $_
+    }
+}
+
+$params = @{
+    CommandName = 'Find-MgGraphPermission'
+    ParameterName = 'SearchString'
+    ScriptBlock = $scriptBlock
+}
+
+Register-ArgumentCompleter @params