add README.md for System.Console (#95254)

Co-authored-by: David Cantú <[email protected]>

src/libraries/System.Console/README.md

@@ -0,0 +1,13 @@
+# System.Console
+Contains the source and tests of assembly System.Console which includes a subset of members of the System namespace that allow you to interact with the standard input and output of console applications.
+
+Documentation can be found at https://learn.microsoft.com/dotnet/api/system.console. The primary class is [`Console`](https://learn.microsoft.com/dotnet/api/system.console).
+
+## Contribution Bar
+- [x] [We only consider fixes to maintain or improve quality](../../libraries/README.md#primary-bar)
+- [x] [We consider PRs that target this library for new source code analyzers](../../libraries/README.md#secondary-bar)
+
+See the [Help Wanted](https://github.com/dotnet/runtime/issues?q=is%3Aopen+is%3Aissue+label%3Aarea-System.Console+label%3A%22help+wanted%22) issues.
+
+## Deployment
+`System.Console` is included in the shared framework. The package does not need to be installed into any project compatible with .NET Standard 2.0.