Extended README.md

Author: Gaming0815

README.md

@@ -2,6 +2,14 @@
 
 This Tool allows you to en- and decrypt given text using the caesar cipher.
 
+## What you need
+
+[Java](https://www.java.com/de/download/) has to be installed to run the tool!
+
+## What you should know
+
+The encryption methods used are outdated and definitely not secure at all!
+
 ---
 
 For any further question contact me at [[email protected]](mailto:[email protected])