add documentation for media storage filesystem

.gitignore

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+venv
+.idea

docs/.gitignore

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+build

docs/Makefile

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+# Minimal makefile for Sphinx documentation
+#
+
+# You can set these variables from the command line, and also
+# from the environment for the first two.
+SPHINXOPTS    ?=
+SPHINXBUILD   ?= sphinx-build
+SOURCEDIR     = source
+BUILDDIR      = build
+
+# Put it first so that "make" without argument is like "make help".
+help:
+	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+
+.PHONY: help Makefile
+
+# Catch-all target: route all unknown targets to Sphinx using the new
+# "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
+%: Makefile
+	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)

docs/README.rst

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+.. role:: raw-html-m2r(raw)
+   :format: html
+
+Introduction
+============
+
+Storing media files involve some work when you decide to scale horizontally.
+Also having to care about disk space and disk mounting may be useless when you are already using cloud infrastructure.
+
+Using cloud storage like Amazon S3 Storage, Azure Blob Storage, or Google Cloud Storage should be easy to configure and use.
+
+See bellow some of the key advantages of using this Magento 2 extension to integrate with various cloud file storage systems in a platform agnostic manner.
+
+
+Useful links
+============
+
+* https://aws.amazon.com/s3/
+
+Author
+======
+
+`George Babarus <https://github.com/georgebabarus>`_

docs/make.bat

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+@ECHO OFF
+
+pushd %~dp0
+
+REM Command file for Sphinx documentation
+
+if "%SPHINXBUILD%" == "" (
+	set SPHINXBUILD=sphinx-build
+)
+set SOURCEDIR=source
+set BUILDDIR=build
+
+if "%1" == "" goto help
+
+%SPHINXBUILD% >NUL 2>NUL
+if errorlevel 9009 (
+	echo.
+	echo.The 'sphinx-build' command was not found. Make sure you have Sphinx
+	echo.installed, then set the SPHINXBUILD environment variable to point
+	echo.to the full path of the 'sphinx-build' executable. Alternatively you
+	echo.may add the Sphinx directory to PATH.
+	echo.
+	echo.If you don't have Sphinx installed, grab it from
+	echo.http://sphinx-doc.org/
+	exit /b 1
+)
+
+%SPHINXBUILD% -M %1 %SOURCEDIR% %BUILDDIR% %SPHINXOPTS% %O%
+goto end
+
+:help
+%SPHINXBUILD% -M help %SOURCEDIR% %BUILDDIR% %SPHINXOPTS% %O%
+
+:end
+popd

docs/source/Makefile

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+# Minimal makefile for Sphinx documentation
+#
+
+# You can set these variables from the command line.
+SPHINXOPTS    =
+SPHINXBUILD   = sphinx-build
+SPHINXPROJ    = ReadtheDocsSphinxTheme
+SOURCEDIR     = .
+BUILDDIR      = build
+
+# Put it first so that "make" without argument is like "make help".
+help:
+	@$(SPHINXBUILD) -M help "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)
+
+.PHONY: help Makefile
+
+# Catch-all target: route all unknown targets to Sphinx using the new
+# "make mode" option.  $(O) is meant as a shortcut for $(SPHINXOPTS).
+%: Makefile
+	@$(SPHINXBUILD) -M $@ "$(SOURCEDIR)" "$(BUILDDIR)" $(SPHINXOPTS) $(O)

docs/source/_static/analytics.html

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+<!-- Global site tag (gtag.js) - Google Analytics -->
+<script async src="https://www.googletagmanager.com/gtag/js?id=UA-54395432-3"></script>
+<script>
+  window.dataLayer = window.dataLayer || [];
+  function gtag(){dataLayer.push(arguments);}
+  gtag('js', new Date());
+
+  gtag('config', 'UA-54395432-3');
+</script>

docs/source/_templates/layout.html

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+{% extends "!layout.html" %}
+
+
+{% block extrahead %}
+    {{ super() }}
+    <meta name="google-site-verification" content="HFkKCMbj7JNJkz8cCQcdI-1wvQzt9G5yxqEGKhT9dW0" />
+{% endblock %}

docs/source/architecture/architecture.rst

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+
+*******************************************
+Extension architecture
+*******************************************
+
+.. note::
+    Before going deeper into the development details, please note that the this Magento 2 module is extending core module interfaces, keeping in mind the backward compatibility and keeping the changes as low asa possible.
+
+.. contents:: Table of Contents
+
+Upload images in admin area
+================================
+
+Uploading files form user interfaces or programmatically at product should be compatible with any customization as log as is using Magento standard interfaces.
+
+Nevertheless the business logic is not changed, and cloud storage services are added using regular/local filesystem interface.
+
+.. image:: static/upload-image.jpg
+  :target: ../_images/upload-image.jpg
+  :alt: Upload image for product or CMS blocks
+
+.. note::
+    Uploading products attachments for downloadable products works just like uploading the product image showed in the above schema.
+
+.. note::
+    Features: :term:`WOOB`
+
+
+Frontend resized image delivery
+================================
+
+Resized images could be delivered directly from storage system after creating the resized image in the main request or return a proxy url responsible to return the image if not exist.
+
+The proxy can be implemented as follow:
+
+* nginx config to request it from storage system and create a fallback request in case of error on Magento resize script
+* in case you don't have access to a web server proxy configuration there is a option to return it directly from default Magento image resize script.
+
+.. image:: static/frontend-image-delivery.jpg
+  :target: ../_images/frontend-image-delivery.jpg
+  :alt: Upload image for product or CMS blocks
+
+.. note::
+    :term:`SWSCNO`
+
+
+Frontend image delivery for original images
+============================================
+
+Original images could be delivered directly from storage system, or the CDN in front of it, by configuring the base media url in admin configuration under Store -> Configuration.
+
+.. note::
+    :term:`WOOB`
+
+.. raw:: html
+   :file: ./../_static/analytics.html