Create invoices.md (#1256)

* Create invoices.md

Adding invoicing process for teammates based outside of the US.

* Update index.md

handbook/people-ops/index.md

@@ -18,6 +18,7 @@
 - [Compensation](compensation.md)
 - [Benefits and perks](benefits-and-perks.md)
 - [Travel](travel.md)
+- [Invoices](invoices.md)
 - [Covered expenses](spending-company-money.md) (aka "Spending company money")
 - [Expense reports](expenses.md)
 - [Vacation/FTO](https://github.com/sourcegraph/Graphbook/blob/master/Holidays,%20FTO,%20and%20leaves%20of%20absence/Vacation%20and%20FTO.md)

handbook/people-ops/invoices.md

@@ -0,0 +1,14 @@
+# Submitting an invoice (teammates based outside of US)
+
+## Monthly invoices
+
+Any teammates based outside of the US are on a contracting structure and will need to submit an invoice once a month for payment. 
+
+### Please follow the process below for submitting monthly invoices:
+
+- All invoices should be sent via email to sourcegraph@officengine.com with noemi@sourcegraph.com copied on all emails.
+- Include any expenses incurred that month as individual line items and attach all expense receipts to the same email with the invoice. 
+- Include any fringe benefits on your invoice as individual line items as well (cell phone, internet, wellness benefits, etc.).
+- Submit monthly invoices by the 2nd of the month so that payments can be issued by the 5th.
+
+All invoices will be paid through [Veem](https://www.veem.com/).