Update tokens.md

tokens.md

@@ -18,24 +18,33 @@
    - Create new API key
    - Copy the key
 
-## 2. Add Tokens to Space Settings
+3. **MongoDB URI**:
+   - Follow [here](https://huggingface.co/spaces/GeorgiosIoannouCoder/cuny-tech-prep-tutorial-5/blob/main/mongodb_atlas_vector_search_setup.md#connection-string)
+
+## 2. Add Tokens to Hugging Face Space Settings
 1. Go INTO your Hugging Face Space settings (⚙️ icon)
 2. Find "Variables and secrets" section
 3. Add  tokens as "New secret" one by one:
 ```toml
-MONGO_URI = "your_mongo_uri"
 HUGGINGFACEHUB_API_TOKEN = "your_huggingface_token_here"
 OPENAI_API_KEY = "your_openai_key_here"
+MONGO_URI = "your_mongo_uri"
 ```
 
-## 3. Access Tokens in app.py
+## 3. Add Access Tokens in app.py
+
+### NOTE: pip install python-dotenv
 
+#### [python-dotenv](https://pypi.org/project/python-dotenv/) gives access to load_dotenv, find_dotenv
 ```python
 import os
+from dotenv import load_dotenv, find_dotenv
 
 # Load environment variable(s)
+load_dotenv(find_dotenv())
 HUGGINGFACEHUB_API_TOKEN = os.getenv("HUGGINGFACEHUB_API_TOKEN")
 OPENAI_API_KEY = os.getenv("OPENAI_API_KEY")
+MONGO_URI = os.getenv("MONGO_URI")
 ```
 
 ## Alternative Methods
@@ -44,6 +53,7 @@ OPENAI_API_KEY = os.getenv("OPENAI_API_KEY")
 # .streamlit/secrets.toml
 HUGGINGFACEHUB_API_TOKEN = "your_token_here"
 OPENAI_API_KEY = "your_key_here"
+MONGO_URI = "your_mongodb_uri_here"
 ```
 
 ## Security Best Practices