Update README.md

Author: stpatrick2016

README.md

@@ -1,6 +1,11 @@
 # Introduction 
 VSTS (TFS) build task to compile MQL5 projects and files inside TFS builds.
 
+# How to use
+The extension is not published in marketplace (yet), so there are only those options to use it:
+* Download the extension from releases tab and upload it into your VSO. You will have to create a publisher account for that (free).
+* Write me and tell me your organization name and I will share it with you. This is the one that preceeding @visualstudio.com, for example, if your VSO's url is https://mywork.visualstudio.com, then your organization name is mywork. It is not a secret information (as far as I aware). The advantage of this approach is that you will automatically get updates.
+
 ## How to develop VSTS build tasks
 * [How to create and package build task](https://docs.microsoft.com/en-us/vsts/extend/develop/add-build-task?view=vsts)
 * [Example tasks](https://github.com/Microsoft/vsts-tasks/tree/master/Tasks)