fix: add sample environment variables and update README for Okta integration

mvc-login/.env.sample

@@ -0,0 +1,4 @@
+CLIENT_ID=your_client_id
+CLIENT_SECRET=your_client_secret
+DOMAIN=your_domain_url
+ISSUER="https://${DOMAIN}/"

mvc-login/.gitignore

@@ -0,0 +1,196 @@
+/target/
+!.mvn/wrapper/maven-wrapper.jar
+
+### STS ###
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+logs/
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+
+performance-results/

mvc-login/README.md

@@ -14,7 +14,7 @@ This sample demonstrates:
 
 ### Auth0 Dashboard
 1. On the [Auth0 Dashboard](https://manage.auth0.com/#/clients) create a new Application of type **Regular Web Application**.
-1. On the **Settings** tab of your application, add the URL `http://localhost:3000/login/oauth2/code/auth0` to the **Allowed Callback URLs** field.
+1. On the **Settings** tab of your application, add the URL `http://localhost:3000/login/oauth2/code/okta` to the **Allowed Callback URLs** field.
 1. On the **Settings** tab of your application, add the URL `http://localhost:3000/` to the **Allowed Logout URLs** field.
 1. Save the changes to your application settings. Don't close this page; you'll need some of the settings when configuring the application below.