Add docs

README.md

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+# MLIR Python Release Scripts
+
+This repository contains setup and packaging scripts for MLIR related
+projects that need to build together. They may eventually go to their
+respective homes, but developing them together for now helps.
+
+## Prep
+
+This repository is meant to be checked out adjacent to source repositories:
+
+* `../llvm-project` : https://github.com/llvm/llvm-project.git
+* `../mlir-npcomp` : https://github.com/llvm/mlir-npcomp.git
+
+### Create a virtual environment:
+
+Not strictly necessary, and if you know what you are doing, do that. Otherwise:
+
+```shell
+python -m venv create ~/.venv/mlir
+source ~/.venv/mlir/bin/activate
+```
+
+### Install common dependencies:
+
+```shell
+python -m pip -r requirements.txt
+```
+
+NOTE: Some older distributions still have `python` as python 2. Make sure you
+are running python3, which on these systems is often `python3`.
+
+## Install into current python environment
+
+If you are just looking to get packages that you can import and use, do:
+
+```shell
+python ./setup_mlir.py install
+```
+
+## Build wheel files (installable archives)
+
+```shell
+python ./setup_mlir.py bdist_wheel
+```

requirements.py

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+numpy>=1.19.4
+pybind11>=2.6.1

setup_mlir.py

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 # This setup.py file adapted from many places, including:
 #   https://github.com/pytorch/pytorch/blob/master/setup.py
+#   various places on stack overflow
+#   IREE setup files
 # (does anyone write these things except by copy-paste-mash-keys until it
 # works?)