doc: Document how to add a tutorial

CONTRIBUTING.md

@@ -46,6 +46,11 @@ lsb_release -sd
   of a pull request acknowledges their consent. To express this consent, please,
   ensure the AUTHORS file has been updated accordingly.
 
+- New functionalities should be documented, for this you can create tutorials as
+  markdown or ipython notebook format in the folder `doc/md` or `doc/ipynb`.
+  Then add a link to this tutorial in the `_navbar.tpl` jinja template and
+  regenerate the doc with `npm run doc` to see the result.
+
 ## Coding guidelines
 
 - For the sake of readability, please, ensure the coding style of your pull

README.md

@@ -59,14 +59,14 @@ Please, refer to the [usage notes](http://n-riesco.github.io/ijavascript/usage.h
 
 ## Documentation
 
-The ijavscript code is documented using [jsdoc](http://usejsdoc.org/).
-You can build the documentation for this package with the command `npm run doc`.
-To run this command you'll need to install ipython on your system as it uses
-nb convert to convert ipython notebooks to html files.
-
 Currently, the documentation is hosted on the gh-pages branch on github, you can
 view it here: <http://n-riesco.github.io/ijavascript/>
 
+The IJavascript code is documented using [jsdoc](http://usejsdoc.org/).
+You can build the documentation for this package with the command `npm run doc`.
+To run this command you'll need to install `ipython` on your system as it uses
+`nbconvert` to convert ipython notebooks to html files.
+
 # Contributions
 
 First of all, thank you for taking the time to contribute. Please, read