Added multitask to the documentatio

TFM.md

@@ -30,6 +30,7 @@ The Manual
       * [Private](#private)
       * [Skip](#skip)
       * [Exit](#exit)
+      * [Multitask](#multitask)
       * [OK](#ok)
       * [Every](#every)
    * [Arguments, Variables and Templates Oh My!](#arguments-variables-and-templates-oh-my)
@@ -593,6 +594,24 @@ bad.task:
     exit: 10
 ```
 
+## Multitask
+A space separated list of task names that can be run in parallel. 
+
+Example use cases:
+ - Pulling/Building/Deleting docker images
+ - Setting up multiple dev projects at once
+ 
+A few things to note:
+ - Avoid changing directories or using the `dir` key as this might impact your other tasks
+ - The logging will appear different. It will be taskname | taskoutput
+ - A lot of applications use stdout as a way to filter debuggign information, `alfred` shows this as `taskname:error` even though it might not be an error.
+ 
+ ```
+run.many.tasks
+    summary: This task will call a bunch of other tasks at the SAME time
+    multitask: taska taskb taskc taskd
+```
+
 ## OK
 A string which is space separated list of tasks to be run if the task was succesful to this point.