Added haxe images documentation.

haxe/README-short.txt

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+Haxe is a modern, high level, static typed programming language with multiple compilation targets.

haxe/content.md

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+# What is Haxe?
+
+[Haxe](https://haxe.org) is an open source toolkit based on a modern, high level, strictly typed programming language, a cross-compiler, a complete cross-platform standard library and ways to access each platform's native capabilities.
+
+The Haxe compiler can output a number of source and binary files. As of Haxe 3.4.0-rc.1, the Haxe compiler can target JavaScript, Java, C#, C++, Python, PHP, Flash SWF, ActionScript 3, Lua, and Neko.
+
+%%LOGO%%
+
+# About this image
+
+This image ships a minimal Haxe toolkit:
+
+-	the `haxe` compiler with its standard library
+-	the `haxelib` library manager
+-	the `neko` virtual machine
+
+# How to use this image
+
+The most straightforward way to use this image is to use a Haxe container as both the build and runtime environment. In your `Dockerfile`, writing something along the lines of the following will compile and run your project:
+
+```dockerfile
+FROM haxe:3.4
+
+RUN mkdir -p /usr/src/app
+WORKDIR /usr/src/app
+
+# install dependencies
+COPY *.hxml /usr/src/app/
+RUN yes | haxelib install all
+
+# compile the project
+COPY . /usr/src/app
+RUN haxe build.hxml
+
+# run the output when the container starts
+CMD ["neko", "Main.n"]
+```
+
+Then, build and run the Docker image:
+
+```console
+$ docker build -t my-haxe-app .
+$ docker run -it --rm --name my-running-app my-haxe-app
+```
+
+## Using the onbuild variants
+
+There are `onbuild` variants that include multiple `ONBUILD` triggers to perform all of the steps in the above Dockerfile, except there is no `CMD` instruction for running the compilation output.
+
+Rewriting the above Dockerfile with `haxe:3.4-onbuild`, we will get:
+
+```dockerfile
+FROM haxe:3.4-onbuild
+
+# run the output when the container starts
+CMD ["neko", "Main.n"]
+```
+
+The `onbuild` variants assume the main compilation hxml file is named `build.hxml`. To use another hxml file, set the `BUILD_HXML` build argument during build:
+
+```console
+$ docker build -t my-haxe-app --build-arg BUILD_HXML=compile.hxml .
+```

haxe/github-repo

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+https://github.com/HaxeFoundation/docker-library-haxe

haxe/license.md

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+View [license information](https://haxe.org/foundation/open-source.html) for the software contained in this image.