Add autorest powershell docker file into azure powershell repo

tools/autorest/Dockerfile

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+FROM mcr.microsoft.com/powershell:7.1.3-ubuntu-18.04
+
+# Install dependencies and clean up
+RUN apt-get update \
+    && apt-get install -y curl \
+    && curl -o- https://raw.githubusercontent.com/creationix/nvm/v0.33.11/install.sh | bash \
+    && . /root/.bashrc \
+    && nvm install 14.15.5 \
+    && npm config set unsafe-perm true \
+    && npm install -g autorest \
+    && npm install -g dotnet-sdk-2.1 \
+    && apt-get -o Acquire::Check-Valid-Until=false install -y \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/* \
+    && locale-gen $LANG && update-locale
+
+RUN mkdir -p /src
+
+WORKDIR /src
+
+CMD [ "bash" ]

tools/autorest/readme.md

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+# All-in-One Docker Image for Azure PowerShell Code Generation
+Packages contained in the image.
+* PowerShell 6.2.4
+* NodeJS 14.15.5
+* Latest autorest
+* Dotnet SDK 2.1
+
+# How to Build the Image
+`docker build -t autorest ./`
+
+# Launch the Image
+`docker run -it -v <path-to-your-source>:/src autorest`
+
+# Code Generation vs Build vs Run
+## Code Generation
+`autorest`
+## Build
+`pwsh build-module.ps1`
+## Run
+`pwsh run-module.ps1`
+## Playback Test
+`pwsh test-module.ps1`