Contributing chapter added

README.md

@@ -27,3 +27,7 @@ It will (more or less) look like this:
 ![Figure 0.1](images/application.png)
 
 Ok, let's start at the beginning...
+
+## About and contributing
+
+This tutorial is maintained by [DjangoGirls](http://djangogirls.org/). If you find any mistakes or want to update the tutorial please [follow the contributing guidelines](contributing/README.md).

SUMMARY.md

@@ -22,4 +22,5 @@
 * [Django Forms](django_forms/README.md)
 * [Domain](domain/README.md)
 * [Homework: add more to your website!](homework/README.md)
+* [Contributing and editing](contributing_and_editing_this_book/README.md)
 

contributing_and_editing_this_book/README.md

@@ -0,0 +1,106 @@
+# How to contribute
+
+Django Girls Tutorial is licensed under *Creative Commons Attribution-ShareAlike 4.0* license. Everyone is free to add, edit and correct the tutorial.
+
+# Editing basics
+
+The source code of the tutorial is [hosted on Github](). Github [Fork & Pull workflow](https://help.github.com/articles/using-pull-requests) is used to accept and review changes.
+
+The tutorial uses [GitBook](https://www.gitbook.io/) service for the publishing the documentation. [See more information about how Gitbook works](http://help.gitbook.io/).
+
+The tutorial is written in [Markdown mark up language](https://help.github.com/articles/markdown-basics).
+
+You can find any discussion about the content of the tutorial on [Github issue tracker](https://github.com/DjangoGirls/tutorial/issues).
+
+# Getting started and prerequisites
+
+For contributing the tutorial the following is needed to get started.
+
+* You have a [Github account](https://github.com)
+* For complex changes you need to be familiar with [Git command line basics](https://help.github.com/articles/set-up-git) or you are using an app ([Windows](https://windows.github.com/), [Mac](https://mac.github.com/)) to push your edits on a local computer to Github
+
+## Fork the repository
+
+First fork [DjangoGirls/tutorial](https://github.com/DjangoGirls/tutorial) project into your personal Github repository:
+
+![Fork button](images/fork.png)
+
+# Editing chapter content
+
+## Simple changes
+
+For a simple changes like typo corrections you can use Github online editor.
+
+* Open your local fork page on Github
+* Go to *README.md* file in any chapter
+* Press *Edit* icon (pen) and you can edit the chapter in Github's online editor
+
+![Edit button](images/edit.png)
+
+Now you can edit the page in Markdown syntax.
+
+![Github editor](images/github_editor.png)
+
+Save changes and make a pull request as explained below.
+
+## New content and complex changes
+
+For adding new chapters, writing longer snippets of text or adding images you need to get the copy of the tutorial to your local computer.
+
+Either use Github app (above) or `git` command line to get the repository locally. You get the repository address from the front page of your own Github repository fork:
+
+    git clone git@github.com:yourgithubusername/tutorial.git
+
+Download [Gitbook Editor](http://help.gitbook.io/editor/README.html) app to your computer.
+
+Then you can open the tutorial in Gitbook Editor (*File* > *Open book*).
+
+![Gitbook](images/gitbook.png)
+
+Make any changes in the tutorial using the editor and then save changes (*Book* > *Save all*).
+
+Then commin the changes using `git` and push the changes to your remote Github repository.
+
+Example:
+
+    $ git status
+    On branch contributing
+    Untracked files:
+      (use "git add <file>..." to include in what will be committed)
+
+        contributing_and_editing_this_book/images/gitbook.png
+
+    $ git add contributing_and_editing_this_book/images/gitbook.png
+
+    $ git commit -m "Added gitbook editor screenshot"
+    [contributing fe36152] Added gitbook screenshot
+     1 file changed, 0 insertions(+), 0 deletions(-)
+     create mode 100644 contributing_and_editing_this_book/images/gitbook.png
+
+    $ git push
+    Counting objects: 11, done.
+    Delta compression using up to 8 threads.
+    Compressing objects: 100% (5/5), done.
+    Writing objects: 100% (5/5), 266.37 KiB | 0 bytes/s, done.
+    Total 5 (delta 1), reused 0 (delta 0)
+    To git@github.com:miohtama/tutorial.git
+       b37ca59..fe36152  contributing -> contributing
+
+# Making a pull request
+
+After you have finished your changes you need to create [a pull request](https://help.github.com/articles/using-pull-requests)  on Github. DjangoGirls will get notified about the pull request, review your changes, suggest any corrections if needed and then *pull* your changes to the master version.
+
+In your own repository on Github press do *Compare & pull request*
+
+![Gitbook](images/pull_request.png)
+
+Fill in the information *why* this change is being made. The reviewer can see the details of actual change, so you don't need repeat the content of the change.
+
+Then press *Create pull request*.
+
+Github emails will notify you for the follow up process.
+
+# Further information and help
+
+For any questions please [contact DjangoGirls](http://djangogirls.org/).
+