Update README.md

Author: NikolasK-source

README.md

@@ -1,14 +1,15 @@
-# Modbus TCP client shm
+# Modbus RTU client shm
 
-Modbus tcp client that stores its data (registers) in shared memory objects.
+Modbus RTU client that stores its data (registers) in shared memory objects.
 
 ## Build
 ```
 git submodule init
+git submodule update
 mkdir build
 cd build
 cmake .. -DCMAKE_CXX_COMPILER=$(which clang++) -DCMAKE_BUILD_TYPE=Release -DCLANG_FORMAT=OFF
-cmake -build . 
+cmake --build . 
 ```
 
 ## Use