Add 'xvc2dap'

xvc2dap.md

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+`xvc2dap.py` is a Python script (found in the `host/` folder) that implements a Xilinx Virtual Cable server
+and talks to a CMSIS-DAP device, acting like a bridge between the two. This way,
+you can use any CMSIS-DAP device (including this project) as a fake Xilinx
+Platform Cable from iMPACT, Vivado, etc.
+
+It requires pyOCD as a dependency (for its builtin `pydapaccess` module).
+
+Usage:
+
+```
+$ ./xvc2dap.py --help
+usage: xvc2dap.py [-h] [--serial SERIAL] address [port]
+
+positional arguments:
+  address          Host to bind to, for the XVC server, default localhost
+  port             port to bind to, for the XVC server, default 2542
+
+optional arguments:
+  -h, --help       show this help message and exit
+  --serial SERIAL  Connect to the CMSIS-DAP device with the specified serial
+                   number, defaults to the first device found.
+```