docs: update new_endpoint_tutorial

Author: sgratzl

docs/new_endpoint_tutorial.md

@@ -64,7 +64,10 @@ the following:
 
 # update the server
 
-TODO sam
+1. create a new file in `/src/server/endpoints/` e.g., `fluview_meta.py` or copy and existing one.
+2. edit the created file `Blueprint("fluview_meta", __name__)` such that the first argument should match the target endpoint name
+3. edit the existing `/src/server/endpoints/__init__.py`, add the newly created file to the imports at the top and to the list of endpoints below.
+
 
 # update the client libraries