README: fixed tree; .gitignore: added .DS_Store exception

.gitignore

@@ -174,3 +174,6 @@ cython_debug/
 # PyPI configuration file
 .pypirc
 
+# MacOS annoying file
+.DS_Store
+

README.md

@@ -15,13 +15,14 @@ This repository needs to be used as a template for all microservices that we are
 
 ## Folder structure:
 
+```
 microservice_name/
 │
 ├── main.py                # Entry point for your FastAPI application
 │
 ├── requirements.txt       # Python dependencies
 ├── Dockerfile.txt         # Docker containerfile
-├── README.md         # Project documentation
+├── README.md              # Project documentation
 ├── .gitignore             # Define what to ignore during version control
 │
 ├── app/                   # Application directory
@@ -68,6 +69,7 @@ microservice_name/
         │   ├── test_endpoints.py
         │   └── test_models.py
         └── ...
+```
 
 ### Some explainig: