(chocolatey-community#18) Add Install-ChocolateyPinnedTaskBarItem stub

The Install-ChocolateyPinnedTaskBarItem function is being removed in
version 3 of Chocolatey CLI. This adds a stub of it to the compatibility
extension to allow packages to keep working.

src/chocolatey-compatibility.extension/extensions/helpers/Install-ChocolateyPinnedTaskBarItem.ps1

@@ -0,0 +1,56 @@
+# Copyright © 2017 - 2021 Chocolatey Software, Inc.
+# Copyright © 2015 - 2017 RealDimensions Software, LLC
+# Copyright © 2011 - 2015 RealDimensions Software, LLC & original authors/contributors from https://github.com/chocolatey/chocolatey
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+function Install-ChocolateyPinnedTaskBarItem {
+  <#
+  .SYNOPSIS
+  Creates an item in the task bar linking to the provided path.
+
+  .NOTES
+  Does not work with SYSTEM, but does not error. It warns with the error
+  message. This command is deprecated and will be removed in version 3.0.0.
+
+  .INPUTS
+  None
+
+  .OUTPUTS
+  None
+
+  .PARAMETER TargetFilePath
+  The path to the application that should be launched when clicking on the
+  task bar icon.
+
+  .PARAMETER IgnoredArguments
+  Allows splatting with arguments that do not apply. Do not use directly.
+
+  .EXAMPLE
+  >
+  # This will create a Visual Studio task bar icon.
+  Install-ChocolateyPinnedTaskBarItem -TargetFilePath "${env:ProgramFiles(x86)}\Microsoft Visual Studio 11.0\Common7\IDE\devenv.exe"
+
+  .LINK
+  Install-ChocolateyShortcut
+
+  .LINK
+  Install-ChocolateyExplorerMenuItem
+#>
+  param(
+    [parameter(Mandatory = $true, Position = 0)][string] $targetFilePath,
+    [parameter(ValueFromRemainingArguments = $true)][Object[]] $ignoredArguments
+  )
+  Write-Warning "Install-ChocolateyPinnedTaskBarItem was removed in Chocolatey CLI v3, and has no functionality any more. If you are the maintainer, please remove it from from your package file."
+  Write-Warning "If you are not the maintainer, please contact the maintainer to update the $packageName package."
+}