Add logo

Author: jfernandez

README.md

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 # bpftop
 
+![bpftop-logo](https://github.com/Netflix/bpftop/blob/main/bpftop-logo.png?raw=true)
+
 `bpftop` provides a dynamic real-time view of running eBPF programs. It displays the average runtime, events per second, and estimated total CPU % for each program. It also provides graphical views of these statistics over time. This tool minimizes overhead by enabling performance statistics only while it is active.
 
 ![bpftop](https://github.com/Netflix/bpftop/blob/main/bpftop.gif?raw=true)