Introduction updated

README.md

@@ -1,3 +1,14 @@
 # Introduction
 
-User guide of Malware Information Sharing Platform (MISP) - A Threat Sharing Platform
+User guide of Malware Information Sharing Platform (MISP) - A Threat Sharing Platform. The user guide audience is security analysts, ICT professionals, security incident handler, malware reverser using MISP to share threat indicators or integrating MISP into other security monitoring tools. The user guide includes the day-to-day usage of the MISP graphical user interface along with the automated interfaces (API) to integrate MISP in a security environment.
+
+## Acknowledgement
+
+The MISP user guide is a collaborative effort between all the contributors to [MISP](https://www.github.com/MISP) including:
+
+- Belgian Ministry of Defence (CERT)
+- [CIRCL Computer Incident Response Center Luxembourg](https://www.circl.lu/)
+- Iklody IT Solutions
+- NATO NCIRC
+- [CERT-EU](https://cert.europa.eu)
+