Update readme

README.md

 # dialogue-systems
+
+## How to configure environment
+Install Python 3.8 (using conda or other methods)
+
+Install poetry
+```bash
+pip install poetry
+```
+
+Go to `rasa_domains` or `rasa_shared` directory
+
+Install dependencies
+```bash
+poetry install
+```
+
+Now environment is configured. 
+If you want to run rasa chatbots, go to chatbot main directory ex. 
+`rasa_domains/rasa_ksi`, and use `rasa` command.