Update README.md

README.md

 TMTC Client
 ====
 
+## Cloning the repository
+Clone the repository with following command:
+```sh
+git clone https://git.ksat-stuttgart.de/source/tmtc.git
+```
+
+Initiate the core components by initiating and updating the submodules
+```sh
+git submodule init
+git submodule sync
+git submoduke update
+```
+
+Install all require packages by running
+```sh
+pip install -r requirements.txt
+```
+
+Now the script can be tested by running
+```sh
+python3 obsw_tmtc_client.py -h
+```
+
+It is recommended to use and setup PyCharm to also use the preconfigured
+run configurations.
+
+
 ## Prerequisites
 Runs with Python 3.8.
 Don't use Python 2.x!