Create Choosing_PCI_ID_for_AFI.md (#95)

Author: AWSNB

hdk/docs/Choosing_PCI_ID_for_AFI.md

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+# Choosing PCI ID for Amazon FPGA Image
+
+As AWS FPGA is a PCIe device, it is required to have a PCI Vendor ID and PCI Device ID.
+
+The combination of Vendor ID and Device ID are used by the instance operating system to identify the device, and load any kernel drivers if required.
+
+The PCI Vendor ID is assigned by PCI SIG, and requires registeration and paying certain fees.
+
+AWS Customers who don't have a registered PCI Vendor ID can use Amazon's vendor ID (0x1D0F) **as long as they comply with all the following requirements**
+1) The Vendor ID (0x1D0F) is used only for designs intended to run on AWS and not to be used or assign to any PCI/PCIe device outside FPGA on AWS
+2) The Device ID is within the range 0xF000 to 0xFFFF
+