doc: updating installation and reuse section

docs/2-installation.md

@@ -12,25 +12,32 @@ The library provides many options for reuse, and the most suitable approach depe
 
 ## Structure and Dependencies
 
-This repository contains three independent CMake-based projects:
+This repository contains several independent CMake-based projects:
 
+* `./template`
+  - entry point for user development and onboarding, [integrated with Visual Studio Code](#easiest-devcontainer-on-visual-studio-code)
+  - the `template/main.cpp` file includes the library and can be easily edited and recompiled without breaking the library.
 * `./src`
   - header-only project containing the Quetzal-CoaTL library
-  - `./src/CMakeList.txt` file is intended as an entry point for library users
   - it depends on the following external dependencies:
     - [GDAL](https://gdal.org/) for geographic data manipulation
     - [Boost](https://www.boost.org/doc/libs/master/index.html) for general purpose C++ utilities
     - [range-v3](https://github.com/ericniebler/range-v3), a range library for C++14/17/20. 
+* `./test`
+    - the unit and integration tests suite
+* `./example`
+    - the example tests suite that are used in the Tutorial documentation section
 * `.`
   - entry point for library development and continuous deployment (CI/CD) processes.
   - it wraps `./src` project with a cmake project, examples, tests and docs.
-  - if you want to build the documentation without Conan, [Doxygen](https://www.doxygen.nl/)
+  - if you want to build the documentation, [Doxygen](https://www.doxygen.nl/)
     is required to generate the documentation from the annotated C++ sources.
 * `./test_package`
   - library installation and Conan packaging verification
 
 @remark
-There are two entry points:
+There are three entry points:
+- The `./template/CMakeLists.txt` is not meant to be modified directly (unless the user decides), but it makes the template demonstration project [easier to use in Visual Studio Code](#easiest-devcontainer-on-visual-studio-code)
 - The top-level `./CMakeLists.txt` file is intended solely for Quetzal developers and contributors to build the entire project code (example and tests) with highly restrictive compilation flags.
 - The `./src/CMakeLists.txt` file, which contains a pure library definition and is intended for customers who prefer using CMake's `add_subdirectory()` to manage dependencies.