add aws login link

Author: mlfbrown

docs/assignments/hw5-25.md

@@ -35,6 +35,10 @@ For this assignment, each group will turn in:
 
 Read through the entire assignment. Despite the fact that there are four key parts, you'll notice that the parts are inter-dependent (e.g., the lambda code is invoked by calls to the API). Decide which teammate will be primarily responsible for which tasks, spelling out who will collaborate for inter-dependent pieces of the assignment.
 
+#### Logging into AWS
+
+Use [this link](https://login.cmu.edu/idp/profile/SAML2/Unsolicited/SSO?providerId=urn:amazon:webservices) to log into your team's AWS account. You'll need AWS access for all steps of this homework.
+
 ### 1. Use AWS lambda to run your backend code
 
 [AWS lambda](https://docs.aws.amazon.com/lambda/latest/dg/welcome.html)