Update documentation

Author: rubenmromero

README.md

@@ -1,10 +1,10 @@
 # Git-Matrix
 
-Script to manage Git projects with multiple submodules and multiple branches per repository.
+Script to manage Git projects with multiple submodules and multiple environment branches per repository.
 
-## What is Git-Matrix?
+## What is a Git-Matrix?
 
-If you have several initialized submodules in your project, and you handle several branches both in the project as in the related submodules, then you have a Git-Matrix case:
+If you have several initialized submodules in your project, and you handle several environment branches both in the project as in the related submodules, then you have a Git-Matrix case:
 
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   | B | B | B | B | | B |
@@ -29,3 +29,10 @@ If you have several initialized submodules in your project, and you handle sever
  -------------------------------------------------------------
 
 ## How does it work?
+
+The git_matrix.sh script works in the following way:
+
+* You directly move across the project environment branches using the usual Git commands such as `git checkout <branch>` or any other similar.
+* Being positioned at the branch you want to update, you can directly run the `./bin/git_matrix.sh` script from the project root folder, witch in a first step updates the active local branch (`git pull`) and submodules status (`git submodule init` & `git submodule update`).
+* If the active branch is the environment branch defined in the first position, the script directly do the following actions:
+ *