script/research/event_graph: add benchmarks figures

script/research/event_graph/benchmarks/benchmarks.md

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+# Benchmarks
+
+# Nodes increase with fixed probability of dropping messages  
+![30 nodes](./f_ni_1.png)
+![100 nodes](./f_ni_2.png)
+![500 nodes](./f_ni_3.png)
+
+# Increase probability of dropping messages with fixed number of nodes 
+![%20 30 nodes](./f_pi_1.png)
+![%20 100 nodes](./f_pi_2.png)
+![%20 500 nodes](./f_pi_3.png)
+
+## The probability reach to 100% for  dropping messages 
+![%20 200 nodes](./f_pi_4.png)
+