Better build process

Author: damianmoore

.dockerignore

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+wheels

Makefile

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+build:
+	./build.sh

README.md

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 # tensorflow-builder
 
-Docker-based build environment as I needed a build of Tensorflow that didn't use modern CPU instructions
+Docker-based build environment that creates Tensorflow packages that don't use optimised CPU instructions such as AVX, AVX2, SSE4.1, SSE4.2 and FMA. This is the version of Tensorflow that is used in [Photonix](https://github.com/damianmoore/photonix) to maintain compatibility with as many people's machines as possible. Performance testing [detailed here](https://github.com/damianmoore/photonix/issues/48#issuecomment-455368921) showed a 13% longer execution time than the official, optimised builds.
+
+
+## Building
+
+Running the command below should output a Python Wheel package in a directory called `wheels`. Beware that building will probably take many hours. Check out the [releases page](https://github.com/damianmoore/tensorflow-builder/releases) to make use of our builds.
+
+```
+make build
+```

build.sh

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+#!/bin/sh
+docker build -t tensorflow-builder .
+mkdir -p wheels
+docker run --rm -it --mount type=bind,source="$(pwd)"/wheels,target=/host_wheels tensorflow-builder bash -c "cp /wheels/* /host_wheels/"
+echo "\nHopefully your package is now in the 'wheels' directory."