Add README documenting experimental status of `LinalgExt`. (#8603)
diff --git a/llvm-external-projects/iree-dialects/include/iree-dialects/Dialect/LinalgExt/README.md b/llvm-external-projects/iree-dialects/include/iree-dialects/Dialect/LinalgExt/README.md
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+This folder defines dialects, interfaces, operations and transformations that are
+- experimental
+- meant to eventually be upstreamed to LLVM.
+
+These are used (or will be used) within IREE as and when required. They are not
+meant to be part of "features" that IREE exposes, or part of IREEs public
+API. Their use within IREE is an internal implementation detail.
+
+Some of the transformations here might not be as well tested as others, mostly
+depending on how load-bearing it is within IREE. Those that are heavily used are
+expected to be well tested, but that might not be the case for experimental
+features. They are expected to achieve the same level of fidelity and testing as
+upstream MLIR when they are being transitioned out of IREE.
