Add X509Toolkit example (#185)

Author: seladb

docs/examples.mdx

@@ -85,6 +85,10 @@ A utility for reassembling IP fragments back to IP packets. It works on pcap and
 
 An application the demonstrates how to collect ClientHello (JA3) and ServerHello (JA3S) TLS fingerprints from live traffic or pcap files, write them to an output file and display various statistics.
 
+## <CodeLink relativePath="/Examples/X509Toolkit">X509Toolkit</CodeLink>
+
+An application provides a set of utilities for working with X.509 certificates. It can be used to view, convert, validate, and extract X.509 certificates from various sources, including PCAP/PCAPNG files.
+
 ## <CodeLink relativePath="/Examples/PcapPlusPlus-benchmark">PcapPlusPlus-benchmark</CodeLink>
 
 The benchmark application used for measuring PcapPlusPlus performance. See [benchmark page](./benchmark) for more details. This application currently compiles on Linux only (where benchmark was running on).