[mlir] List lead maintainers for MLIR

mlir/Maintainers.md

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+# MLIR Maintainers
+
+This file is a list of the [maintainers](https://llvm.org/docs/DeveloperPolicy.html#maintainers) for MLIR.
+
+The following people are the active maintainers for the project.
+For the sake of simplicity, responsibility areas are subdivided into broad categories, which are further
+subdivided into individual components, such as dialects.
+Please reach out to them for code reviews, questions about their area of expertise, or other assistance.
+
+## Lead Maintainers
+
+Lead Maintainers are responsible for the entirety of the MLIR project, in particular for components not
+covered by anyone else, and can also serve as escalation contacts for arbitration.
+
+- Alex Zinenko \
+  [email protected] (email),
+  [@ftynse](https://github.com/ftynse) (GitHub),
+  ftynse (Discourse)
+- Renato Golin \
+  [email protected] (email),
+  [@rengolin](https://github.com/rengolin) (GitHub),
+  rengolin (Discourse)
+- Jacques Pienaar \
+  [email protected] (email),
+  [@jpienaar](https://github.com/jpienaar) (GitHub),
+  jpienaar (Discourse)
+- Matthias Springer \
+  [email protected] (email),
+  [@matthias-springer](https://github.com/matthias-springer) (GitHub),
+  matthias-springer (Discourse)