Merge branch 'docs/#88-add_postman_collection_for_nlp' into 'master'

[docs, #88] add postman collection for nlp

See merge request !73

src/README.md

 ### Docker based Setup
+
 Use the following command to start all containers (First run takes a lot of time):
 
     docker-compose up --build
 
 Afterwards the following services are available:
 
-  * Port 8080: ktor-server
-  * Port 8000: nlp_server
-  * Port 27017: MongoDB-Server
+- Port 8080: ktor-server
+- Port 8000: nlp_server
+- Port 27017: MongoDB-Server
 
 To access the OpenAPI documentation of nlp_server open **http://localhost:8080/docs**.
 
 The following paths are mounted by default:
 
-  * nltk_data: to store nltk-data, e.g. big models, which we don't want to download every time we start our container.
-  * mongodb_data: stores the data of the mongodb container.
+- nltk_data: to store nltk-data, e.g. big models, which we don't want to download every time we start our container.
+- mongodb_data: stores the data of the mongodb container.
+
+### Postman collection
+
+The postman collection for nlp used in the demo can be found under /docs/postman/