Add typical workflow to README

Currently, it is easy to overlook the section mentioning running tasks via the
web UI. By adding a typical workflow, and some section headings, we make this
clearer.

README.md

@@ -42,6 +42,18 @@ For more information, please consult the [Rails guides on autoloading and reload
 
 ## Usage
 
+The typical Maintenance Tasks workflow is as follows:
+
+1. [Generate a class describing the Task](#creating-a-task) and the work to be done.
+2. Run the Task
+    - either by [using the included web UI](#running-a-task-from-the-web-ui),
+    - or by [using the command line](#running-a-task-from-the-command-line),
+    - or by [using Ruby](#running-a-task-from-ruby).
+3. [Monitor the Task](#monitoring-your-tasks-status)
+    - either by using the included web UI,
+    - or by manually checking your task's run's status in your database.
+4. Optionally, delete the Task code if you no longer need it.
+
 ### Creating a Task
 
 A generator is provided to create tasks. Generate a new task by running:
@@ -500,8 +512,12 @@ end
 
 ### Running a Task
 
+#### Running a Task from the Web UI
+
 You can run your new Task by accessing the Web UI and clicking on "Run".
 
+#### Running a Task from the command line
+
 Alternatively, you can run your Task in the command line:
 
 ```sh-session
@@ -528,6 +544,8 @@ bundle exec maintenance_tasks perform Maintenance::ParamsTask \
   --arguments post_ids:1,2,3 content:"Hello, World!"
 ```
 
+#### Running a Task from Ruby
+
 You can also run a Task in Ruby by sending `run` with a Task name to Runner:
 
 ```ruby