Small helper for the PowerShell 50 char clipboard problem

Author: StefanScherer

powershell-50-characters/Dockerfile

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+FROM microsoft/windowsservercore
+WORKDIR "Program Files"
+RUN rd /S /Q WindowsPowerShell\Modules\PSReadLine
+WORKDIR /

powershell-50-characters/README.md

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+# PowerShell and the 50 characters clipboard problem
+
+At the moment the `microsoft/windowsservercore` image has the problem
+that pasting a longer text will be cut at 50 characters.
+
+Try it with the following command, copy it to clipboard,
+
+```
+Write-Host Paste and execute this command does not loose characters.
+```
+
+then start an interactive container
+
+```
+docker run -it microsoft/windowsservercore powershell
+```
+
+Now paste your clipboard into it (I also can repro it from my Mac pasting it into a Windows container). The command is missing the last two words. Try it again in microsoft/nanoserver and it will work.
+
+A fix could be removing PSReadLine from windowsservercore until it is fixed in PSReadLine module.
+
+```Dockerfile
+FROM microsoft/windowsservercore
+WORKDIR "Program Files"
+RUN rd /S /Q WindowsPowerShell\Modules\PSReadLine
+WORKDIR /
+```
+
+## See also
+- https://github.com/moby/moby/issues/29646
+- https://github.com/lzybkr/PSReadLine/issues/460