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/helpers/xlsx.py

@@ -0,0 +1,19 @@
+import pandas as pd
+
+
+def load_excel_data(infile):
+    """Load an xlsx document.
+
+    Args:
+        infile (str): Path to an xlsx file.
+
+    Returns:
+        dict: xlsx sheets
+
+    """
+    sheets = {}
+    xlsx = pd.ExcelFile(infile)
+    for sheetname in xlsx.sheet_names:
+        sheets[sheetname] = xlsx.parse(sheetname)
+    return sheets
+