Upload gNB install script

OpenAirInterface/OpenAirInterface-Install-Scripts/oai_gNB_install.sh

+#!/bin/bash
+
+## Install dependencies
+
+sudo apt-get update -y
+sudo apt-get install git -y
+sudo apt-get install libuhd4.2.0 -y
+sudo dpkg -i --force-overwrite /var/cache/apt/archives/libuhd4.2.0_4.2.0.1-0ubuntu1~focal1_amd64.deb
+
+## Install OAI gNB
+
+git clone https://gitlab.eurecom.fr/oai/openairinterface5g.git  ~/oai
+cd ~/oai
+git checkout 2022.41
+git am ~/flexric/multiRAT/oai/oai.patch --whitespace=nowarn
+source oaienv
+cd cmake_targets
+sudo ./build_oai -I -w USRP -i
+sudo ./build_oai --gNB -c -C -w USRP --ninja
+sudo ./build_oai --gNB -c -C -w SIMU --ninja
+~