Add first code explanation

README.md

@@ -1,9 +1,18 @@
-## Welcome to tutify.org!
+# Welcome to tutify.org! 👨‍🏫
 
 We're happy that you're interested in becoming part of our tutify community!
 
-Here, you will find the documentation of the project and everything you need to know: 
-* How it works
-* How to get involved
-* How to start your local tutify.org
-* ...
+
+Let's start to give a brief overview about our code. 
+
+## Code
+The code to run a tutify.org platform consists of differnt parts which are structured like the following
+* **Screening Tool** – a tool that is used to verify tutors (university students) via an internet video identity check
+    * _Backend_ which provides the API and acts as a bridge between the following two components...
+    * _Tutors Frontend_ which is the frontend part that the tutors use in the verification process
+    * _Screener Frontend_ which is the frontend part that the screeners of a tutify-organization use to verify tutors
+* **Matching Algorithm** – a complex and highly optimized mathematical algorithm that is used to do matchings between tutors and tutees. 
+* **User platform** – sophisticated platform where tutors and tutees can manage their matches, data etc. and which is protected via a login process. 
+    * _Backend_ which provides and API and manage emails, user data etc. 
+    * _User platform_ which provides the web frontend
+