PR: integrate sionna-rt module and 5G-LENA nr module with updated version of ns3-mmwave (#44)

* Add Sionna-RT module

* Add 5G-LENA module

* Update README

* Update  submodules

Author: MinaYonan123

.gitmodules

@@ -1,6 +1,6 @@
 [submodule "e2sim-kpmv3"]
 	path = e2sim-kpmv3
 	url = https://github.com/MinaYonan123/e2sim-kpmv3.git
-[submodule "ns-3-mmwave-oran"]
-	path = ns-3-mmwave-oran
-	url = https://github.com/MinaYonan123/ns-3-mmwave-oran.git
+[submodule "mmwave-LENA-oran"]
+	path = mmwave-LENA-oran
+	url = https://github.com/MinaYonan123/mmwave-LENA-oran.git