Merged PR 77494: Add basic README.md file

Add basic README.md file

README.md

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+# brocksolutions/sqlcmd
+
+This repository contains the Dockerfile for the `brocksolutions/sqlcmd` container image. This image provides the latest version of
+Microsoft's `sqlcmd` (Go) tool.
+
+Microsoft does not (yet) distribute an official `sqlcmd` container image, so this image is built by installing the `sqlcmd` tool
+into a base Debian image.
+
+## Available Tags
+
+`latest`  - The latest version of the container.
+`1.5.0.x` - A specific build of the image.
+
+## Running the Container
+
+The entrypoint in the container is set to the `/usr/bin/sqlcmd`. This means you can run the container in the same way you would run
+the `sqlcmd` tool locally, and simply pass in any additional parameters you amy need.  For example:
+
+``` powershell
+docker run --rm brocksolutions/sqlcmd -S myserver -U myuser -P mypassword -Q "SELECT @@VERSION"
+```