Add Splunk guide and app details to documentation

tools/crypto-firewall.md

@@ -95,6 +95,8 @@ You may use the hosts file with below applications to block these miners on whol
 
 - <img src="https://github.com/chartingshow/crypto-firewall/blob/master/assets/images/snort-logo.png" alt="Snort3" width="16" height="16" /> **[Snort3 Instructions Guide](https://github.com/chartingshow/crypto-firewall/blob/master/docs/help-guides/snort3-instructions.md)** - Is a high-performance, open-source network intrusion detection and prevention system (IDS/IPS) that analyzes traffic in real time to detect and block malicious activity.
 
+- <img src="https://github.com/chartingshow/crypto-firewall/blob/master/assets/images/splunk-icon.png" alt="Splunk" width="16" height="16" /> **[Splunk Instructions Guide](https://github.com/chartingshow/crypto-firewall/blob/master/docs/help-guides/splunk-instructions.md)** and **[Crypto Firewall Splunk App](https://splunkbase.splunk.com/app/8341)** - It offers an unified interface for monitoring, troubleshooting, detecting threats, ensuring compliance and gaining operational intelligence through customizable dashboards, alerts and visualizations.
+
 - <img src="https://github.com/chartingshow/crypto-firewall/blob/master/assets/images/suricata-logo.png" alt="Suricata" width="16" height="16" /> **[Suricata Linux & Mac OS Instructions Guide](https://github.com/chartingshow/crypto-firewall/blob/master/docs/help-guides/suricata-linux-macos-instructions.md)** and **[Suricata Windows Instructions Guide](https://github.com/chartingshow/crypto-firewall/blob/master/docs/help-guides/suricata-windows-instructions.md)** - Is an open-source intrusion detection system (IDS) and intrusion prevention system (IPS) developed by the Open Information Security Foundation (OISF).
 
 - <img src="https://github.com/chartingshow/crypto-firewall/blob/master/assets/images/suricata-logo.png" alt="Suricata SNI" width="16" height="16" /> **[Suricata SNI Linux Instructions Guide](https://github.com/chartingshow/crypto-firewall/blob/master/docs/help-guides/suricata-sni-linux-instructions.md)** and **[Suricata SNI Mac OS Instructions Guide](https://github.com/chartingshow/crypto-firewall/blob/master/docs/help-guides/suricata-sni-macos-instructions.md)** and **[Suricata SNI Windows Instructions Guide](https://github.com/chartingshow/crypto-firewall/blob/master/docs/help-guides/suricata-sni-windows-instructions.md)** - Refers to Suricata's ability to inspect TLS (encrypted) traffic and extract the Server Name Indication (SNI) - the domain name requested during HTTPS connections-enabling visibility and filtering of encrypted traffic based on domain names.