modify README

README.md

-<h1 align="center">
-    <a href="https://openairinterface.org/"><img src="https://openairinterface.org/wp-content/uploads/2015/06/cropped-oai_final_logo.png" alt="OAI" width="550"></a>
-</h1>
+# OpenXG-RAN #
 
-<p align="center">
-    <a href="https://gitlab.eurecom.fr/oai/openairinterface5g/-/blob/master/LICENSE"><img src="https://img.shields.io/badge/license-OAI--Public--V1.1-blue" alt="License"></a>
-    <a href="https://releases.ubuntu.com/18.04/"><img src="https://img.shields.io/badge/OS-Ubuntu18-Green" alt="Supported OS"></a>
-    <a href="https://www.redhat.com/en/enterprise-linux-8"><img src="https://img.shields.io/badge/OS-RHEL8-Green" alt="Supported OS"></a>
-</p>
+OpenXG-RAN is originally forked from OpenAirInterface, and evolves at its own step.
 
-<p align="center">
-    <a href="https://jenkins-oai.eurecom.fr/job/RAN-Container-Parent/"><img src="https://img.shields.io/jenkins/build?jobUrl=https%3A%2F%2Fjenkins-oai.eurecom.fr%2Fjob%2FRAN-Container-Parent%2F&label=build%20Images"></a>
-</p>
-
-<p align="center">
-  <a href="https://hub.docker.com/r/rdefosseoai/oai-enb"><img alt="Docker Pulls" src="https://img.shields.io/docker/pulls/rdefosseoai/oai-enb?label=eNB%20docker%20pulls"></a>
-  <a href="https://hub.docker.com/r/rdefosseoai/oai-lte-ue"><img alt="Docker Pulls" src="https://img.shields.io/docker/pulls/rdefosseoai/oai-lte-ue?label=LTE-UE%20docker%20pulls"></a>
-  <a href="https://hub.docker.com/r/rdefosseoai/oai-gnb"><img alt="Docker Pulls" src="https://img.shields.io/docker/pulls/rdefosseoai/oai-gnb?label=gNB%20docker%20pulls"></a>
-  <a href="https://hub.docker.com/r/rdefosseoai/oai-nr-ue"><img alt="Docker Pulls" src="https://img.shields.io/docker/pulls/rdefosseoai/oai-nr-ue?label=NR-UE%20docker%20pulls"></a>
-</p>
-
-# OpenAirInterface License #
-
-### Included Fixes: ###
-- Ease of use of gprof and address sanitizer for debugging purposes
-- Updated json files to allow for GDB, real-time debugging capabilities
-- Updated logging features to minimally log only key connection milestones. This imroves scalability of multiple UEs.
-- Updated logging to include time stamp for timing analysis
-- Updated memory allocation procedures to correct size requirements
-- Added debugging features to handle signal terminations
-- nfapi.c pullarray8 fix invalid pointer math
-- Overlapping destination and source memory in memcpy, so updated to memmove to check for this bug
-- Advanced error checking mechanisms in critical pack and unpack functions
-- Created option for CPU assignment to UE to improve scalability
-- Added EPC integration to allow multiple individual UE entities to each have their USIM information parced by the executables
-- Updated random value seeds to minimize probability of error in generation of random values
-- Enables capability round robin scheduler if desired
-- Enables capability real time scheduler if desired
-- Added new standalone functions to the UE phy-layer (phy_stub_ue.c) to incorporate individual UE entities
-- Updated sending and packing functions in UE (lte_ue.c) to incorporate new standalone changes
-- Incorporated semaphores to control timing of incoming downlink packets
-- Implemented new queuing system to handle message exchange from UE to eNB and vice versa
-- Updated global value in nFAPI for size of subframe
-- Updated global value to increase scalability in system
-
-
-# Where to Start #
-
- *  [The implemented features](./doc/FEATURE_SET.md)
- *  [How to build](./doc/BUILD.md)
- *  [How to run the modems](./doc/RUNMODEM.md)
-
-# RAN repository structure #
-
-The OpenAirInterface (OAI) software is composed of the following parts: 
-
-<pre>
-openairinterface5g
-├── ci-scripts        : Meta-scripts used by the OSA CI process. Contains also configuration files used day-to-day by CI.
-├── cmake_targets     : Build utilities to compile (simulation, emulation and real-time platforms), and generated build files.
-├── common            : Some common OAI utilities, other tools can be found at openair2/UTILS.
-├── doc               : Contains an up-to-date feature set list and starting tutorials.
-├── executables       : Top-level executable source files.
-├── LICENSE           : License file.
-├── maketags          : Script to generate emacs tags.
-├── nfapi             : Contains the NFAPI code. A local Readme file provides more details.
-├── openair1          : 3GPP LTE Rel-10/12 PHY layer / 3GPP NR Rel-15 layer. A local Readme file provides more details.
-│   ├── PHY
-│   ├── SCHED
-│   ├── SCHED_NBIOT
-│   ├── SCHED_NR
-│   ├── SCHED_NR_UE
-│   ├── SCHED_UE
-│   └── SIMULATION    : PHY RF simulation.
-├── openair2          : 3GPP LTE Rel-10 RLC/MAC/PDCP/RRC/X2AP + LTE Rel-14 M2AP implementation. Also 3GPP NR Rel-15 RLC/MAC/PDCP/RRC/X2AP.
-│   ├── COMMON
-│   ├── DOCS
-│   ├── ENB_APP
-│   ├── F1AP
-│   ├── GNB_APP
-│   ├── LAYER2/RLC/   : with the following subdirectories: UM_v9.3.0, TM_v9.3.0, and AM_v9.3.0.
-│   ├── LAYER2/PDCP/PDCP_v10.1.0
-│   ├── M2AP
-│   ├── MCE_APP
-│   ├── NETWORK_DRIVER
-│   ├── NR_PHY_INTERFACE
-│   ├── NR_UE_PHY_INTERFACE
-│   ├── PHY_INTERFACE
-│   ├── RRC
-│   ├── UTIL
-│   └── X2AP
-├── openair3          : 3GPP LTE Rel10 for S1AP, NAS GTPV1-U for both ENB and UE.
-│   ├── COMMON
-│   ├── DOCS
-│   ├── GTPV1-U
-│   ├── M3AP
-│   ├── MME_APP
-│   ├── NAS
-│   ├── S1AP
-│   ├── SCTP
-│   ├── SECU
-│   ├── TEST
-│   ├── UDP
-│   └── UTILS
-└── targets           : Top-level wrappers for unitary simulation for PHY channels, system-level emulation (eNB-UE with and without S1), and realtime eNB and UE and RRH GW.
-</pre>