docs: 📝 🚀✨ Update README: Added token expiration ⏳ and security tips 🔒! Plus, fresh new images 🌟📸 for token setup—making things clearer and prettier! 🛠️💼

Closes microsoft#129

Author: indcoder

00-course-setup/README.md

@@ -35,7 +35,19 @@ Then select `Generate new token`.
 
 ![Generate Token](./images/generate-token.png)
 
-Copy your new token that you have just created. You will now add this to your `.env` file included in this course. 
+Instead of a token with no expiration date, we  recommend creating one for limited days eg: 60 days [if done at the start of April 2025 conveniently coincides with the duration of [AI Skills fest](https://techcommunity.microsoft.com/blog/microsoftlearnblog/register-now-for-the-microsoft-ai-skills-fest/4292261?wt.mc_id=DT-MVP-500304
+
+![Expiry date of token](./images/token_with_expiry_date.png)
+
+Also, as an additional security measure, we can restrict the token to only be used for the `ai-agents-for-beginners` repository [[Least Privilege Principle](https://en.wikipedia.
+org/wiki/Principle_of_least_privilege)].
+
+![Select GitHub repository](./images/token_select_repositories.png)
+
+Finally, select the **Models** scope under Permissions and the `Read-only` access.
+![Select Models Marketplace](./images/token_chose_permission.png)
+
+Please copy your new token that you have just created, and set it as your `GITHUB_TOKEN` in your `.env` file you have created from `.env-sample` in this course.
 
 ## Add this to your Environment Variables
 
@@ -47,7 +59,8 @@ cp .env.example .env
 
 This will copy the example file and create a `.env` in your directory, fill in the values for the environment variables. You can locate the values for each environment variable in the following locations of the [Azure AI Foundry](https://ai.azure.com?WT.mc_id=academic-105485-koreyst) portal:
 
-Open that file and paste the token you created into the `GITHUB_TOKEN=` field of the .env file. 
+Open that file and paste the token you created into the `GITHUB_TOKEN=` field of the .env file.
+
 - `AZURE_SUBSCRIPTION_ID` - On the **Overview** page of your project within **Project details**.
 - `AZURE_AI_PROJECT_NAME` - At the top of the **Overview** page for your project.
 - `AZURE_OPENAI_RESOURCE_GROUP` - On the **Overview** page of the **Management Center** within **Project properties**.
@@ -73,7 +86,7 @@ As a security best practice, we'll use [keyless authentication](https://learn.mi
 
 Next, open a terminal and run `az login` to sign in to your Azure account.
 
-## Sign in to Azure
+## Keyless Authentication
 
 Login with your Azure AI account used to provision the Azure resources.
 
@@ -83,7 +96,7 @@ Open a new terminal and enter the following command and follow the instructions
 
 Once you've logged in, select your subscription in the terminal.
 
-## Access the environment variables.
+## Access the environment variables
 
 We'll import `os` and `load_dotenv` so that you can access the environment variables.