add readme

README

+A *very* simple Java servlet protected behind UMD CAS.
+
+Currently Implemented:
+Basic Servlet (page visit counter)
+CAS Login
+CAS Logout (through link)
+
+Needs to Be Implemented:
+Proper session destruction on CAS logout
+Removing "?ticket" number on redirect from CAS login
+
+Tested In:
+Red Hat 7.6
+Tomcat 8
+
+Dependencies:
+cas-client-core-3.5.1 (http://central.maven.org/maven2/org/jasig/cas/client/cas-client-core/3.5.1/)
+slf4j-api-1.7.28 (https://www.slf4j.org/download.html)
+slf4j-simple-1.7.28 (https://www.slf4j.org/download.html)
+
+Simple/Naive Method of Adding CAS:
+1. Drop dependencies in WEB-INF
+2. Add CAS filters
+3. Modify filters to only apply for "secured" web content