Added quick guide with step-by-step instructions on how to use this plugin.

QUICKGUIDE.md

@@ -0,0 +1,146 @@
+# Quick Guide
+ 
+ * [Installation](#installation)
+ * [Basic Usage](#basic-usage)
+ * [IP Blocking](#ip-blocking)
+
+Installation
+------------
+
+Please check [README.md](README.md#installation)
+
+Basic Usage
+-----------
+
+1) Create an outage in the future
+
+    Go to 
+    `Dashboard ► Site administration ► Plugins ► Authentication ► Outage manager ► Manage`
+    and click `Create outage` to create an outage with the following settings:
+    
+    - Outage auto start: `false`
+    - Warning duration: `1 hour`
+    - Start date and time: `Somewhere around 2 hours from now`
+    - Outage duration: `1 hour`
+    - Title and Description: `Leave default`
+    
+    _You should not see any warning message yet._
+
+1) Change that outage to activate the warning
+
+    Edit the outage, set:
+    
+    - Start date and time: `Sometime in the future but less than 1 hour from now`
+    
+    _The warning bar with a countdown is displayed!_
+    
+    **What is happening now?**
+    Nothing, this is just a warning for all users.
+
+1) Change that outage so it becomes active
+
+    Edit the outage, set:
+    
+    - Start date and time: `Sometime in the past but less than 1 hour ago`
+
+    _The warning changes color and shows the outage estimated end time._
+
+    **What is happening now?**
+    Nothing yet, it is just a warning to all users that the system may be unstable but it is still online.
+    That will change when we are using the IP Blocking feature.
+
+1) Activate maintenance mode
+
+    **Note:** This step will happen automatically if you create an outage with the option to `Auto start maintenance mode`.
+
+    Execute the following command from your Moodle instalation directory:
+    
+    `php admin/cli/maintenance.php --enable`
+
+    _Anyone who tries to use Moodle now will receive a maintenance message._
+
+1) Perform the maintenance activities.
+
+    At this point it is safe to perform the required maintenance as no one can use the system, not even admins.
+
+1) Disable the maintenance mode
+
+    `php admin/cli/maintenance.php --disable`
+
+    _Your site is back, but the outage warning still shows the maintenance (unless the outage ending time has reached)._
+
+1) End the outage
+
+    Using the GUI, you can do it in a few different ways (choose one) 
+    - Click 'Finish' at the warning bar
+    - Click 'Finish' at the outage management page
+    - Edit the outage and lower the duration so it is finished by now
+
+    _The outage bar should disappear (you may need to refresh the page)._
+    
+
+IP Blocking
+-----------
+
+We will manage outages from the CLI this time, but it does not matter which way you create them.
+
+Execute the commands from your Moodle instalation directory and leave the browser open so you can see the changes.
+
+1) Enable IP Blocker and allow your IP Address
+
+    Go to 
+    `Dashboard ► Site administration ► Plugins ► Authentication ► Outage manager ► Settings`
+    and set `Allowed IP list` to `127.0.0.1` (or your IP address if not local).
+
+1) Create an outage
+
+    This command will create an outage starting in 30 seconds, with a warning period of 15 seconds.
+    It will automatically start (trigger maintenance mode).
+
+    `php auth/outage/cli/create.php -w=20 -s=30 --autostart=Y`
+
+    Refresh the page but you will not see anything yet.
+
+1) Wait until it starts
+
+    Keep refreshing the page, in less than 10 seconds it will display the warning.
+
+    Wait until the outage starts.
+
+1) Maintenance mode should be active
+
+    You cannot browse anymore because Moodle's maintenance mode is active, no one can use the system until it is manually disabled.
+
+1) Perform the maintenance activities.
+
+    At this point it is safe to perform the required maintenance as no one can use the system, not even admins.
+
+1) Disable maintenance mode.
+
+    `php admin/cli/maintenance.php --disable`
+
+1) Browse with an allowed IP
+
+    **Do not finish the outage yet...**
+
+    Because you are white-listed in the IP Blocking, you can test the site while it is not open for normal users.
+
+1) Browse with a blocked IP
+
+    Change the IP settings to a different IP (but do not leave it blank, which disables IP Blocking):
+
+    Go to
+    `Dashboard ► Site administration ► Plugins ► Authentication ► Outage manager ► Settings`
+    and set `Allowed IP list` to `1.2.3.4`
+
+    Save and refresh.
+    
+    _You should see the maintenance page until the outage period is over._
+
+1) Finish the outage
+
+    Finish the outage using the CLI:
+    
+    `php auth/outage/cli/finish.php --active`
+
+    Now the site is back and available for everyone.

README.md

@@ -9,6 +9,7 @@
 * [Screenshots](#screenshots)
 * [Installation](#installation)
 * [How to use](#how-to-use)
+* [Quick Guide](#quick-guide)
 * [Why is it an auth plugin?](#why-it-is-an-auth-plugin)
 * [Feedback and issues](#feedback-and-issues)
 
@@ -106,6 +107,12 @@ Creates a new outage.
   -b,  --block              blocks until outage starts.
 ```
 
+Quick Guide
+-----------
+
+Please see [QUICKGUIDE.md](QUICKGUIDE.md) for step-by-step examples on
+how to test and use the Outage Manager.
+
 Why it is an auth plugin?
 -------------------------