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Signed-off-by: José Bollo <jose.bollo@iot.bzh>

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+The widgets
+===========
+
+The widgets
+-----------
+
+The widgets are described by the technical recommendations
+[widgets] and [widgets-digsig].
+
+In summary, **widgets are ZIP files that can be signed and
+whose content is described by the file <config.xml>**.
+
+### The configuration file config.xml
+
+This is one of the important file of the widget.
+It fully describes the widget.
+
+Here is the example of the config file for the QML application SmartHome.
+
+```xml
+<?xml version="1.0" encoding="UTF-8"?>
+<widget xmlns="http://www.w3.org/ns/widgets" id="smarthome" version="0.1">
+  <name>SmartHome</name>
+  <icon src="smarthome.png"/>
+  <content src="qml/smarthome/smarthome.qml" type="text/vnd.qt.qml"/>
+  <description>This is the Smarthome QML demo application. It shows some user interfaces for controlling an 
+automated house. The user interface is completely done with QML.</description>
+  <author>Qt team</author>
+  <license>GPL</license>
+</widget>
+```
+
+The most important items are:
+
+- **\<widget id="......"\>**: gives the id of the widget. It must be unique.
+
+- **\<widget version="......"\>**: gives the version of the widget
+
+- **\<icon src="..."\>**: gives a path to the icon of the application
+  (can be repeated with different sizes)
+
+- **\<content src="..." type="..."\>**: this indicates the entry point and its type.
+  The types handled are set through the file /etc/afm/afm-launch.conf
+
+Further development will add handling of <feature> for requiring and providing
+permissions and services.
+
+### Tools for managing widgets
+
+This project includes tools for managing widgets.
+These tools are:
+
+- ***wgtpkg-info***: command line tool to display
+  informations about a widget file.
+
+- ***wgtpkg-installer***: command line tool to
+  install a widget file.
+
+- ***wgtpkg-pack***: command line tool to create
+  a widget file from a widget directory.
+
+- ***wgtpkg-sign***: command line tool to add a signature
+  to a widget directory.
+
+For all these commands, a tiny help is available with
+options **-h** or **--help**.
+
+There is no tool for unpacking a widget. For doing such operation,
+you can use the command **unzip**.
+
+To list the files of a widget:
+
+```bash
+$ unzip -l WIDGET
+```
+
+To extract a widget in some directory:
+
+```bash
+$ unzip WIDGET -d DIRECTORY
+```
+
+*Note that DIRECTORY will be created if needed*.
+
+### Signing a widget
+
+To sign a widget, you need a private key and its certificate.
+
+The tool **wgtpkg-sign** creates or replace a signature file in
+the directory of the widget BEFORE its packaging.
+
+There are two types of signature files: author and distributor.
+
+Example 1: add an author signature
+
+```bash
+$ wgtpkg-sign -a -k me.key.pem -c me.cert.pem DIRECTORY
+```
+
+Example 2: add a distributor signature
+
+```bash
+$ wgtpkg-sign -k authority.key.pem -c authority.cert.pem DIRECTORY
+```
+
+### Packing a widget
+
+This operation can be done using the command **zip** but
+we provide the tool **wgtpkg-pack** that may add checking.
+
+Example:
+```bash
+$ wgtpkg-pack DIRECTORY -o file.wgt
+```
+
+### Getting data about a widget file
+
+The command **wgtpkg-info** opens a widget file, reads its **config.xml**
+file and displays its content in a human readable way.
+
+Writing a widget
+----------------
+
+### What kind of application?
+
+The file **/etc/afm/afm-launch.conf** explain how to launch applications.
+(It is the current state that use afm-user-daemon. In a future, it may be
+replace by systemd features.)
+
+Currently the applications that can be run are:
+
+- binary applications: their type is ***application/x-executable***
+
+- HTML5 applications: their type is ***text/html***
+
+- QML applications: their type is ***text/vnd.qt.qml***
+
+### The steps for writing a widget
+
+1. make your application
+
+2. create its configuration file **config.xml**
+
+3. sign it
+
+4. pack it
+
+Fairly easy, no?
+
+Organization of directory of applications
+-----------------------------------------
+
+### directory where are stored applications
+
+Applications can be installed in different places: the system itself, extension device.
+On a phone application are typically installed on the sd card.
+
+This translates to:
+
+ - /usr/applications: system wide applications
+ - /opt/applications: removable applications
+
+From here those paths are referenced as: "APPDIR".
+
+The main path for applications is: APPDIR/PKGID/VER.
+
+Where:
+
+ - APPDIR is as defined above
+ - PKGID is a directory whose name is the package identifier
+ - VER is the version of the package MAJOR.MINOR
+
+This organization has the advantage to allow several versions to leave together.
+This is needed for some good reasons (rolling back) and also for less good reasons (user habits).
+
+### Identity of installed files
+
+All files are installed as user "afm" and group "afm".
+All files have rw(x) for user and r-(x) for group and others.
+
+This allows every user to read every file.
+
+### labeling the directories of applications
+
+The data of a user are in its directory and are labelled by the security-manager
+using the labels of the application.
+
+[meta-intel]:       https://github.com/01org/meta-intel-iot-security                "A collection of layers providing security technologies"
+[widgets]:          http://www.w3.org/TR/widgets                                    "Packaged Web Apps"
+[widgets-digsig]:   http://www.w3.org/TR/widgets-digsig                             "XML Digital Signatures for Widgets"
+[libxml2]:          http://xmlsoft.org/html/index.html                              "libxml2"
+[openssl]:          https://www.openssl.org                                         "OpenSSL"
+[xmlsec]:           https://www.aleksey.com/xmlsec                                  "XMLSec"
+[json-c]:           https://github.com/json-c/json-c                                "JSON-c"
+[d-bus]:            http://www.freedesktop.org/wiki/Software/dbus                   "D-Bus"
+[libzip]:           http://www.nih.at/libzip                                        "libzip"
+[cmake]:            https://cmake.org                                               "CMake"
+[security-manager]: https://wiki.tizen.org/wiki/Security/Tizen_3.X_Security_Manager "Security-Manager"
+[app-manifest]:     http://www.w3.org/TR/appmanifest                                "Web App Manifest"
+[tizen-security]:   https://wiki.tizen.org/wiki/Security                            "Tizen security home page"
+[tizen-secu-3]:     https://wiki.tizen.org/wiki/Security/Tizen_3.X_Overview         "Tizen 3 security overview"
+
+
+
+