Update README.md

README.md

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 # sacds
 InCommon SeamlessAccess Central Discovery Service
+
+## Running
+### Prerequisities
+<p>node / npm (if you have a mac, you can install these via homebrew)
+<p>Once node and npm are installed, you need to:
+<p><code>npm install express</code>
+<p>You can run the app using:
+<p><code>node bin/www</code>
+<p>
+<p>Then open your browser and navigate to: https://localhost:3000/DS/WAYF
+<p>You can invoke a session initiation using the standard URL parameters <code>entityID</code> and <code>return</code>:
+<p>example: http://localhost:3000/DS/WAYF?entityID=https://login.at.internet2.edu/Saml2/proxy_saml2_backend.xml&return=https%3A%2F%2Flogin.at.internet2.edu%2FSaml2%2Fdisco