First update of Readme

README.md

-Gitlab-ci template:
-´´´
-  image: docker.io/labrobotica/labrobotica:latest
-
-  variables:
-    GIT_SUBMODULE_STRATEGY: recursive
-    FROM_RDEPENDS_CI: "false"
-    TAG_VERSION: $CI_COMMIT_TAG
-    PACKAGE_NAME: "package_name"
-  
-  include:
-    remote: 'https://gitlab.iri.upc.edu/labrobotica/test/packaging_ci/-/raw/master/packaging-ci.yml'
-´´´
+Packaging_ci                        {#mainpage}
+================
+
+## Description
+
+The pourpose of this package is to provide a gitlab Continuous Integration pipeline that automatically generates a package .deb file, upload it to our apt package server and trigger the same process to the packages that depends on it. That proccess is triggered when a new tag as version number (x.y.z) is generated.
+
+It also provides two [scripts](./scripts) that must be uploaded to the apt server in folder ~/repo_scripts.
+
+## Scripts
+
+#### update_repo script
+
+This script will be called from the gitlab CI jobs *update_repo_tag* and *update_repo_rdep*. It must be located at ~/repo_scripts folder in the package server. It will be executed in the package server.
+
+It has two arguments:
+ - The first argument is the name of the .deb file to be uploaded. Usually iri-<package_name>-dev.
+ - The second is the Ubuntu distribution.
+
+It tries to upload the .deb file for 10 times each 5 seconds. On success, it shows the list of packages on the server and deletes the .deb file.
+
+#### reverse_dependency script
+
+This script will be called from the gitlab CI job *modify_rdepends_ci*. It must be located at ~/repo_scripts folder in the package server. It will be executed in the docker.
+
+It has one argument:
+ - The target package name