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+# Project architecture
+
+A typical project architecture would be :
+
+```tree
+<project-root-path>
+│
+├── conf.d/
+│   ├── autobuild/
+│   │   ├── agl
+│   │   │   └── autobuild
+│   │   ├── linux
+│   │   │   └── autobuild
+│   │   └── windows
+│   │       └── autobuild
+│   ├── app-templates/
+│   │   ├── README.md
+│   │   ├── autobuild/
+│   │   │   ├── agl
+│   │   │   │   └── autobuild.in
+│   │   │   ├── linux
+│   │   │   │   └── autobuild.in
+│   │   │   └── windows
+│   │   │       └── autobuild.in
+│   │   ├── cmake/
+│   │   │   ├── config.cmake.sample
+│   │   │   ├── export.map
+│   │   │   └── macros.cmake
+│   │   ├── deb/
+│   │   │   └── config.deb.in
+│   │   ├── rpm/
+│   │   │   └── config.spec.in
+│   │   └── wgt/
+│   │       ├── config.xml.in
+│   │       ├── config.xml.in.sample
+│   │       ├── icon-default.png
+│   │       ├── icon-html5.png
+│   │       ├── icon-native.png
+│   │       ├── icon-qml.png
+│   │       └── icon-service.png
+│   ├── packaging/
+│   │   ├── config.spec
+│   │   └── config.deb
+│   ├── cmake
+│   │   └── config.cmake
+│   └── wgt
+│      └── config.xml.in
+├── <libs>
+├── <target>
+│   └── <files>
+├── <target>
+│   └── <file>
+└── <target>
+    └── <files>
+```
+
+| # | Parent | Description |
+| - | -------| ----------- |
+| \<root-path\> | - | Path to your project. Hold master CMakeLists.txt and general files of your projects. |
+| conf.d | \<root-path\> | Holds needed files to build, install, debug, package an AGL app project |
+| app-templates | conf.d | Git submodule to app-templates AGL repository which provides CMake helpers macros library, and build scripts. config.cmake is a copy of config.cmake.sample configured for the projects. SHOULD NOT BE MODIFIED MANUALLY !|
+| autobuild | conf.d | Scripts generated from app-templates to build packages the same way for differents platforms.|
+| cmake | conf.d | Contains at least config.cmake file modified from the sample provided in app-templates submodule. |
+| wgt | conf.d | Contains at least config.xml.in template file modified from the sample provided in app-templates submodule for the needs of project (See config.xml.in.sample file for more details). |
+| packaging | conf.d | Contains output files used to build packages. |
+| \<libs\> | \<root-path\> | External dependencies libraries. This isn't to be used to include header file but build and link statically specifics libraries. | Library sources files. Can be a decompressed library archive file or project fork. |
+| \<target\> | \<root-path\> | A target to build, typically library, executable, etc. |
+
+## Manage app-templates submodule
+
+### Update
+
+You may have some news bug fixes or features available from app-templates
+repository that you want. To update your submodule proceed like the following:
+
+```bash
+git submodule update --remote
+git commit -s conf.d/app-templates
+```
+
+This will update the submodule to the HEAD of master branch repository. Save
+the modification by commiting it in your master git project.
+
+### Checkout submodule to a git tag
+
+You could just want to update at a specified repository tag or branch or commit
+, here are the method to do so:
+
+```bash
+cd conf.d/app-templates
+# Choose one of the following depending what you want
+git checkout <tag_name>
+git checkout --detach <branch_name>
+git checkout --detach <commit_id>
+# Then commit
+cd ../..
+git commit -s conf.d/app-templates
+```