Adding scripts folder in README

Signed-off-by: Raphael Defosseux <raphael.defosseux@openairinterface.org>

README.txt

@@ -14,6 +14,7 @@ openair-cn-cups
     ├── spgw_c :  Directory containing CMakefile.txt and object files generated by compilation of SPGW-C network function. 
     ├── spgw_u :  Directory containing CMakefile.txt and object files generated by compilation of SPGW-U network function. 
 ├── etc :         Directory containing the configuration files to be deployed for each network function.
+└── scripts :     Directory containing scripts for the CI process
 └── src :         Source files of network functions.
     ├── common :    Common header files
     │   ├── msg :   ITTI messages definitions.