Update chart-of-accounts.md
Update cost-centers-and-budgeting.md
Update chart-of-accounts.md
Update credit-limit.md
Update journal-vouchers.md
Update making-payments.md
Update purchase-invoice.md
Update sales-invoice.md
Update material-request.md
Update purchase-order.md
Update supplier-master.md
Update supplier-quotation.md
Add recurring Sales Order documentation
Merge pull request #13 from PrakashH/patch-5

Update chart-of-accounts.md
Merge pull request #14 from PrakashH/patch-6

Update cost-centers-and-budgeting.md
Merge pull request #15 from PrakashH/patch-7

Update chart-of-accounts.md
Merge pull request #16 from PrakashH/patch-8

Update credit-limit.md
Merge pull request #19 from PrakashH/patch-11

Update purchase-invoice.md
Merge pull request #17 from PrakashH/patch-9

Update journal-vouchers.md
Merge pull request #18 from PrakashH/patch-10

Update making-payments.md