Add System.Diagnostics.Process README.md (#78525)

* Add System.Diagnostics.Process README.md

* Fix typo

Co-authored-by: Jeff Handley <jeffhandley@users.noreply.github.com>

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+# System.Diagnostics.Process
+Contains the source and tests of assembly System.Diagnostics.Process which includes a subset of members of the System.Diagnostics namespace that allow you to interact with local and remote system processes.
+
+Documentation can be found at https://learn.microsoft.com/dotnet/api/system.diagnostics. The primary class is [`Process`](https://learn.microsoft.com/dotnet/api/system.diagnostics.process).
+
+## 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.Diagnostics.Process+label%3A%22help+wanted%22) issues.
+
+## Deployment
+`System.Diagnostics.Process` is included in the shared framework and also provided as a [NuGet package](https://www.nuget.org/packages/System.Diagnostics.Process).