[docs] updated toc and added projects docs

docs/user/projects/docs.user.projects.task.md

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+---
+{
+	"_label": "Tasks"
+}
+---
+
+## Tasks
+
+Project is broken into Tasks and each Task is allocated to a resource. In ERPNext, you can also create an allocate a Task independently of a Project. If you define the start and end dates, it will add calendar events for the same and also show the task on the Gantt Chart that you can use for monitoring the Project.
+
+
+
+![Tasks](img/tasks.png)
+
+