Update README.md

Adding description of new functionality

database/README.md

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+# Disarm-AttackFlow Builder
+
+The Disarm-AttackFlow Builder is a modified version of the MITRE AttackFlow Builder that integrates the tactics
+and techniques of the DISARM framework into the application. The application maintains all functionalities, and 
+allows a user to build models using the unified framework and export them in STIX language format. All the 
+DISARM tactics and techniques have STIX objects associated with them to a comprable standard to the MITRE ATT&CK 
+STIX objects.
 
 # Attack Flow