Add deprecation notice

Author: Charles-Gagnon

README.md

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 [![Python 2.7|3.4|3.5|3.6|3.7|3.8](https://img.shields.io/badge/python-2.7 | 3.4 | 3.5 | 3.6 | 3.7 | 3.8-blue.svg)](https://github.com/dbcli/mssql-cli)
 
 # mssql-cli
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+> **DEPRECATION NOTICE** mssql-cli is on the path to deprecation, and will be fully replaced by the new [go-sqlcmd](https://learn.microsoft.com/sql/tools/sqlcmd/go-sqlcmd-utility) utility once it becomes generally available. We are actively in development for the new sqlcmd, and would love to hear feedback on it [here](https://github.com/microsoft/go-sqlcmd/issues)!
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 [**mssql-cli**](https://github.com/dbcli/mssql-cli) is an interactive command line query tool for SQL Server. This open source tool works cross-platform and proud to be a part of the [dbcli](https://github.com/dbcli) community. 
 
 ![mssql-cli Autocomplete](https://github.com/dbcli/mssql-cli/raw/main/screenshots/mssql-cli-autocomplete.gif)