Front Haul Interface Library first seed code contribution

This first version supports only mmWave per 5G NR and it is not yet
optimized and it is a first draft prior to the November 2019 Release A
The following mandatory features of the ORAN FH interface are not yet
supported in this initial release:
1) RU Category:  Support of CAT-B RU (i.e. precoding in RU)
2) Beamforming: Beam Index Based and Real Time BF weights
3) Transport Features: QoS over FrontHaul and Application Fragmentation
Additional Information available in the readme.txt file
xran root refers to the o-du/phy/fhi_lib folder

Issue-Id: ODUPHY-1

Change-Id: I9c801f99bfbc3911514c4e7ff51ea7c52c5666c5
Signed-off-by: luis farias <luis.farias@intel.com>