[docs] added pages from user manual

docs/docs.user.customize.modules.md

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+---
+{
+	"_label": "Hiding Modules and Features"
+}
+---
+### Hiding Unused Features
+
+As you have seen from this manual that ERPNext contains tons of feature that you may not use. We have observed that most users start with using 20% of the features, though a different 20%. To hide fields belonging to features you will not use, go to:
+
+> Setup > Customize ERPNext > Disable Features.
+
+Check / uncheck the features you want to use and refresh your page for the changes to take effect.
+
+---
+
+### Hiding Module Icons
+
+To hide modules (icons) from the home page, go to:
+
+Setup > Customize ERPNext > Modules Setup
+
+> Note: Modules are automatically hidden for users that have no permissions on the documents within that module. For example, if a user has no permissions on Purchase Order, Purchase Request, Supplier, the “Buying” module will automatically be hidden.