Added EEAS framework objects and STIX generator

Added framework objects:
- Added technique T0066 "Degrade adversary" to TA02
- Added technique T0067 "Plan to discredit credible sources" to TA02
- Added technique T0068 "respond to breaking news event" to TA02
- Added technique T0069  "respond to active crisis" to TA02
- Added technique T0070 "Analyze existing communities" to TA02
- Added technique T0071 "Find echo chambers" to TA13
- Added technique T0072  "Segment audiences" to TA13

Added STIX generator from repo DISARM-stix2, and added code to generate github files, databases, and STIX from the same Jupyter notebook.

CODE/DISARM-STIX2/objects/relationship.py

@@ -0,0 +1,21 @@
+from stix2 import Relationship, properties, ExternalReference
+
+
+def make_disarm_subtechnique_relationship(source, target):
+    """Creates a relationship between the parent technique and sub-technique.
+
+    Args:
+        source (str): Subtechnique ID
+        target (str): Parent technique ID
+
+    Returns:
+        A Relationship object.
+
+    """
+    relationship = Relationship(
+        source_ref=source,
+        target_ref=target,
+        relationship_type="subtechnique-of"
+    )
+
+    return relationship