Finish tutorial01.rst

Co-authored-by: Hector Hurtado <hector.hurtado@bbva.com>

docs/source/tutorial/tutorial01.rst

@@ -82,4 +82,105 @@ Backup that Database!
 
 **Junior**
 
-  ...  
+  I've just installed it in my laptop, but I don't understand how all of
+  this is going to work.
+
+**Senior**
+
+  Don't worry it is pretty easy.  Basically we will provide an HTTP
+  endpoint managed by Kapow! at the **Corporate Server**; when the
+  project team wants to perform a backup they only need to call the
+  endpoint and Kapow! will call the backup script.
+
+**Junior**
+
+  It seems pretty easy.  How can I create the endpoint?
+
+**Senior**
+
+  First you have to start a fresh server. Please run this in your laptop:
+
+  .. code-block:: console
+
+     $ kapow server
+
+  .. warning::
+
+     It is important that you run this command in the same directory
+     in which you downloaded ``backup_db.sh``.
+
+**Junior**
+
+  Done! But it doesn't do anything.
+
+**Senior**
+
+  Now you have the port 8080 open but don't have any endpoints defined.
+  To define our endpoint you have to run this in another terminal:
+
+  .. code-block:: console
+
+     $ kapow route add -X PUT /db/backup -e ./backup_db.sh
+
+  This will create an endpoint accessible via
+  ``http://localhost:8080/db/backup``. This endpoint have to be invoked
+  with the ``PUT`` method to prevent accidental calls.
+
+**Junior**
+
+  Cool! Do we need to do all this stuff every time we start the
+  **Corporate Server**?
+
+**Senior**
+
+  Not at all. The have thought of everything. You can put all your route
+  definitions in a special script file and pass it to the server on
+  startup. They call those files `POW` files and have ``.pow``
+  extension.
+
+  It should look something like:
+
+  .. code-block:: console
+
+     $ cat backup.pow
+     kapow route add -X PUT /db/backup -e ./backup_db.sh
+
+  And then you can start Kapow! with it:
+
+  .. code-block:: console
+
+     $ kapow server backup.pow
+
+**Junior**
+
+  Great! Now it says:
+
+  .. code-block:: console
+
+     $ kapow server backup.pow
+     2019/11/26 11:40:01 Running powfile: "backup.pow"
+     {"id":"19bb4ac7-1039-11ea-aa00-106530610c4d","method":"PUT","url_pattern":"/db/backup","entrypoint":"./backup_db.sh","command":"","index":0}
+     2019/11/26 11:40:01 Done running powfile: "backup.pow"
+
+  I understand that this is proof that we have the endpoint available.
+
+**Senior**
+
+  That appears to be the case, but better we check it.
+
+  Call it with ``curl``:
+
+  .. code-block:: console
+
+     $ curl -X PUT http://localhost:8080/db/backup
+
+**Junior**
+
+  Yay! I can see the log file at ``/tmp/backup_db.log``
+
+**Senior**
+
+  That's great. I am going to install all this in the *Corporate Server*
+  and forget about the old procedure.
+
+  That enough for your first day! You can go home.