Update README.md

added how to get TSI API key note

README.md

@@ -12,7 +12,10 @@ AI Applications generated by `create-tsi`, use LLMs hosted by T-Systems on Open
 
 The purpose of `create-tsi` is to make the AI Application creation process easy, flexible and fast. With `create-tsi` you can generate bots, write agents and customize them for specific use cases.
 
-Just run
+### Please Note
+To get started with `create-tsi`, you need a T-Systems API key. You can request trial access via [this form](https://forms.gle/1HzUGWGG12CmCnbk6).
+
+Once you have the key, just run
 
 ```bash
 npx create-tsi@latest