add part of docs

Author: Sebastian-Webster

docs/SUPPORTED_MYSQL_DOWNLOADS.md

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+## Support for MySQL binary downloads
+
+*Keep in mind that this section is only for support provided by ```mysql-memory-server``` for versions of MySQL that it downloads from the MySQL CDN. This section does not apply to versions of MySQL that are already installed on your system.*
+
+#### Binaries not available for download
+
+- Versions 8.0.29, 8.0.38, 8.4.1, and 9.0.0 are not available for download for any operating systems as MySQL removed them from the CDN due to critical issues.
+
+- Versions 5.7.32 - 5.7.44 are not available for download only on macOS as MySQL stopped supporting macOS Mojave starting from 5.7.32 for the rest of the 5.7.x line.
+
+#### Native Binary Architectures
+
+*Architectures used can be overridden by the ```arch``` option provided your OS and system supports running applications that use those architectures.*
+
+Linux, Windows, macOS x64: MySQL v5.7.19 - v9.2.0
+
+Linux ARM64: MySQL v8.0.31 - v9.2.0
+
+macOS ARM64: MySQL v8.0.26 - v9.2.0
+
+Windows ARM64: N/A - Read about the ```arch``` option to run this package on your system
+
+#### Operating System Minimum Version Requirements
+
+Windows - No documented minimum version
+
+Linux - No documented minimum version
+
+macOS:
+
+
+
+*Document last updated in v1.9.0*