Add README

Author: andyundso

README.md

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+# Setup MSSQL Action
+
+This GitHub action automatically installs a SQL server and `sqlcmd` on Windows and Linux.
+
+On Windows, we install an Express edition of the container. On Linux, a Docker container is started. `sqlcmd` is actually preinstalled on all Windows images as well as Ubuntu 20.04 and 22.04. Essentially, it only has an effect on Ubuntu 24.04.
+
+## Usage
+
+### Inputs
+
+* `components`: Specify the components you want to install. Can be `sqlengine` and `sqlcmd`.
+* `force-encryption`: When you request to install `sqlengine`, you can set this input to `true` in order to encrypt all connections to the SQL server. The action will generate a self-signed certificate for that. Default is `false`.
+* `sa-password`: The sa password for the SQL instances. Default is `bHuZH81%cGC6`.
+* `version`: Version of the SQL server you want to install (2017, 2020 or 2022).
+
+## License
+
+The scripts and documentation in this project are released under the MIT License.
+
+## Credits
+
+Inspiration for the action came from https://github.com/marketplace/actions/mssql-suite.