Added psrs vs. time plot

FGRP1_discoveries.html

@@ -78,6 +78,10 @@ As always, we are extremely grateful to all of our volunteers, especially those
 contributed to these new discoveries. To say "we couldn't have done it without you!" would be a terrible
 understatement!</p>
 
+<br>
+<h3>Timeline of <i>Fermi</i>-LAT Pulsar Discoveries</h3>
+<img style="width: 500px;" alt="Timeline" src="img/psrs_vs_time.png">
+<br>
 
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