[docs] backup manager docs

docs/user/accounts/docs.user.accounts.payments.md

@@ -10,6 +10,17 @@ Payments made against Sales Invoices or Purchase Invoices can be made by clickin
 1. Enter the cheque number, cheque date.
 1. Save and Submit.
 
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+![Payment Entry](img/payment-entry.png)
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 Payments can also be made independent of invoices by creating a new Journal Voucher and selecting the type of payment.
 
 #### Incoming Payment

docs/user/accounts/docs.user.accounts.purchase_invoice.md

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 or click on “Make Purchase Invoice” in Purchase Order or Purchase Receipt.
 
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+![Purchase Invoice](img/purchase-invoice.png)
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 The concept of “Posting Date” is again same as Sales Invoice. “Bill No” and “Bill Date” helps to track the bill number as set by your Supplier for reference.
 
 #### Accounting Impact

docs/user/accounts/docs.user.accounts.sales_invoice.md

@@ -13,6 +13,19 @@ You can create a Sales Invoice directly from
 
 or from the “Make Sales Invoice” button in the Sales Order or Delivery Note.
 
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+![Sales Invoice](img/sales-invoice.png)
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 #### Accounting Impact
 
 All Sales must be booked against an “Income Account”. This refers to an Account in the “Income” section of your Chart of Accounts. It is a good practice to classify your income by type (like product income, service income etc). The Income Account must be set for each row of the Items table.