Added more content for CSRF lesson

webgoat-lessons/csrf/src/main/resources/lessonPlans/en/CSRF_Login.adoc

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+== Login CSRF attack
+
+In a login CSRF attack, the attacker forges a login request to an honest site using the attacker’s username 
+and password at that site. If the forgery succeeds, the honest server responds with a `Set-Cookie` header 
+that instructs the browser to mutate its state by storing a session cookie, logging the user into
+the honest site as the attacker. This session cookie is used to bind subsequent requests to the user’s session and hence
+to the attacker’s authentication credentials. Login CSRF attacks can have serious consequences, for example 
+see the picture below where an attacker created an account at google.com the victim visits the malicious
+website and the user is logged in as the attacker. The attacker could then later on gather information about
+the activities of the user.
+
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+
+image::images/login-csrf.png[caption="Figure: ", title="Login CSRF from Robust Defenses for Cross-Site Request Forgery", width="800", height="500", style="lesson-image" link="http://seclab.stanford.edu/websec/csrf/csrf.pdf"]
+
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+For more information read the following http://seclab.stanford.edu/websec/csrf/csrf.pdf[paper]
+
+In this assignment try to see if WebGoat is also vulnerable for a login CSRF attack. First create a user 
+based on your own username prefixed with csrf. So if your username is `tom` you must create
+a new user called `csrf-tom`
+