[docs] made structure for user docs combining manual and existing help

docs/docs.user.support.customer_issue.md

@@ -0,0 +1,17 @@
+---
+{
+	"_label": "Customer Issue"
+}
+---
+If you are selling **Items** under warranty or if you have sold and extended service contract Annual Maintenance Contract (AMC), your **Customer** may call you about an issue or a bread-down and give you the Serial No of this Item.
+
+To record this, you can create a new **Customer Issue** and add the **Customer** and **Item** / **Serial No**. The system will then automatically fetch the Serial No’s details and indicate whether this is under warranty or AMC.
+
+You must also add a description of the **Customer**’s issue and assign it to the person who needs to look into solving the issue.
+
+To create a new **Customer Issue**:
+
+> Support > Customer Issue > New Customer Issue
+
+If a Customer visit is required to address the issue, you can create a new Maintenance Visit record from this.
+