Add documentation about board public access

README.markdown

@@ -55,6 +55,7 @@ Documentation
 #### Working with projects
 
 - [Creating projects](docs/creating-projects.markdown)
+- [Sharing boards and tasks](docs/sharing-projects.markdown)
 - [Automatic actions](docs/automatic-actions.markdown)
 
 #### Working with tasks

docs/sharing-projects.markdown

@@ -0,0 +1,31 @@
+Sharing boards and tasks
+========================
+
+By default, boards are private but it's possible to make a board public.
+
+A public board can't be modified, it's a **read-only access**.
+This access is protected by a random token, only people who have the right token can see the board.
+
+Public boards are automatically refreshed every 60 seconds.
+Task details are also available in read-only.
+
+Usage examples:
+
+- Share your board with someone outside of your organization
+- Display the board on a large screen in your office
+
+Enable public access
+-------------------
+
+Select your project, then click on "Public access" and finally click on the button "Enable public access".
+
+![Enable public access](http://kanboard.net/screenshots/documentation/project-enable-sharing.png)
+
+After that, you got the public link and the RSS feed.
+The activity feed is available only when the public access is activated.
+
+![Disable public access](http://kanboard.net/screenshots/documentation/project-disable-sharing.png)
+
+You can also disable the public access whenever you want.
+Each time, you enable or disable the public access a new random token is generated.
+The old link will not work anymore.