[docs] major update

docs/user/buying/docs.user.buying.material_request.md

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+---
+{
+	"_label": "Material Request"
+}
+---
+A Material Request is a simple document identifying a requirement of a set of Items (products or services) for a particular reason.
+
+
+![Workflow](img/material-request-workflow.jpg)
+
+
+
+
+To generate a Material Request manually go to:
+
+> Buying > Material Request > New Material Request
+
+**Step 1**
+
+![Material Request](img/material-request-1.png)
+
+
+
+
+A Material Request can be generated:
+
+- By a User.
+- Automatically from a Sales Order.
+- Automatically when the Projected Quantity of an Item in stores reaches a particular level.
+- Automatically from your Bill of Materials if you use Production Plan to plan your manufacturing activities.
+
+**Step 2**
+
+![Material Request 2](img/material-request-2.png)
+
+
+
+
+In the Material Request form, 
+
+- Fill in the Items you want and their quantities.
+
+- If your Items are inventory items, you must also mention the Warehouse where you expect these Items to be delivered. This helps to keep track of the [Projected Quantity](docs.user.stock.projected_quantity.html)for this Item.
+
+
+- You can optionally add the Terms, using the Terms and Conditions master and also the reason.
+
+
+> Info: Material Request is not mandatory. It is ideal if you have centralized buying so that you can collect this information from various departments.
+
+#### Authorization
+
+If you want your Material Request to be authorized by a senior person like a Purchase Manager then you can give “Submit” rights only to that person. Everyone can create requests, but only the authorized person can “Submit”.