modify readme, no space between pre

README.md

-# OpenXG License #
+# OpenXG #
 
 OpenXG is under OpenXG license.
 
-The OpenAirInterface (OAI) software is composed of the following parts: 
+The OpenXG software is composed of the following parts: 
 
 <pre>
-openairinterface5g
-├── cmake_targets     : Build utilities to compile (simulation, emulation and real-time platforms), and generated build files.
+ran
+├── build             : Build utilities to compile (simulation, emulation and real-time platforms), and generated build files.
 ├── common            : Some common utilities.
 ├── doc               : Contains an up-to-date feature set list and starting tutorials.
 ├── LICENSE           : License file.
 ├── etc               : Configuration files.
 ├── src               : 3GPP NR Rel-15 DU files. 
-    ├── common        : common files.
-    ├── main          : main function for DU.
-    ├── phy           : phy laywer files.
-    ├── mac           : mac laywer files.
-    ├── rlc           : rlc laywer files.
-    └── rfdriver      : rf  driver.
-
+    ├── common        : Common files.
+    ├── main          : Main function for DU.
+    ├── phy           : PHY laywer files.
+    ├── mac           : MAC laywer files.
+    ├── rlc           : RLC laywer files.
+    └── rfdriver      : RF  driver files.
 </pre>