new: [doc] MITRE CTI README added

crawler/mitre-cti/README.md

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+# MITRE CTI (ATT&CK) import for CyCAT
+
+Import ATT&CK techniques into CyCAT. Additional namespace `mitre-attack-id` and `capec` as also added. Relationships are extracted.
+
+# Usage
+
+~~~
+usage: cti-importer.py [-h] [-p PATH]
+
+MITRE CTI (ATT&CK) import for CyCAT
+
+optional arguments:
+  -h, --help            show this help message and exit
+    -p PATH, --path PATH  Path to the CTI git repository
+~~~
+