OptionRomPkg: Added bus driver for FTDI USB to serial adapters

Contributed-under: TianoCore Contribution Agreement 1.0
Signed-off-by: Ashley DeSimone <ashley.e.desimone@intel.com>

git-svn-id: https://svn.code.sf.net/p/edk2/code/trunk/edk2@14817 6f19259b-4bc3-4df7-8a09-765794883524

OptionRomPkg/Bus/Usb/FtdiUsbSerialDxe/ReadMe.txt

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+
+=== FTDI USB SERIAL OVERVIEW ===
+
+This is a bus driver that enables the EfiSerialIoProtocol interface
+for FTDI8U232AM based USB-to-Serial adapters.
+
+=== STATUS ===
+
+Serial Input: Functional on real hardware.
+Serial Output: Functional on real hardware.
+
+Operating Modes: Currently the user is able to change all operating modes
+except timeout and FIFO depth.
+The default operating mode is:
+	Baudrate:     115200
+	Parity:       None
+	Flow Control: None
+	Data Bits:    8
+	Stop Bits:    1
+Notes: 
+	Data Bits setting of 6,7,8 can not be combined with a Stop Bits setting of 1.5
+
+        At baudrates less than 9600 some of the characters may be transmitted incorrectly.
+
+=== COMPATIBILITY ===
+
+Tested with:
+An FTDI8U232AM based USB-To-Serial adapter, the UEFI Shell, and the SerialTest application 
+using a PuTTY Terminal
+
+See CompatibleDevices.txt for a list of devices which have been confirmed to work with this 
+driver.