Merge pull request #13 from mitre-attack/docs/data-sources

Add ATT&CK v10 and data source documentation

CHANGELOG.md

@@ -1,2 +1,21 @@
-# 21 June 2021
-Initial release of ATT&CK collection data.
+# Changes to ATT&CK in STIX 2.1
+
+## 21 October 2021 - ATT&CK Spec v2.1.0
+Changes to ATT&CK in STIX for October 2021 ATT&CK Content Release (ATT&CK v10)
+
+| Feature | [Available in STIX 2.0](https://github.com/mitre/cti) | [Available in STIX 2.1](https://github.com/mitre-attack/attack-stix-data) |
+|:--------|:-----------------------------------------------------:|:-------------------------------------------------------------------------:|
+| Added full objects for data sources and data components. See [the data sources section of the USAGE document](https://github.com/mitre-attack/attack-stix-data/blob/master/USAGE.md#data-sources-and-data-components) for more information about data sources, data components, and their relationships with techniques. | :white_check_mark: | :white_check_mark: |
+| Added `x_mitre_attack_spec_version` field to all object types. This field tracks the version of the ATT&CK Spec used by the object. Consuming software can use this field to determine if the data format is supported; if the field is absent the object will be assumed to use ATT&CK Spec version `2.0.0`. | :x: | :white_check_mark: |
+
+## 21 June 2021 - ATT&CK Spec v2.0.0
+Initial release of ATT&CK in STIX 2.1.
+
+ATT&CK in STIX 2.0 (ATT&CK Spec < 2.0.0) can be found on our [MITRE/CTI](https://github.com/mitre/cti) GitHub repository which contains the same dataset but in STIX 2.0 and without many of the quality-of-life features available in ATT&CK Spec v2.0.0+.
+
+| Feature | [Available in STIX 2.0](https://github.com/mitre/cti) | [Available in STIX 2.1](https://github.com/mitre-attack/attack-stix-data) |
+|:--------|:-----------------------------------------------------:|:-------------------------------------------------------------------------:|
+| Added `x_mitre_modified_by_ref` field to all object types. This field tracks the identity of the individual or organization which created the current _version_ of the object. | :x: | :white_check_mark: | 
+| Added `x_mitre_domains` field to all non-relationship objects. This field tracks the domains the object is found in. | :x: | :white_check_mark: |
+| Added [collection](https://github.com/center-for-threat-informed-defense/attack-workbench-frontend/blob/master/docs/collections.md) objects to track information about specific releases of the dataset and to allow the dataset to be imported into [ATT&CK Workbench](https://github.com/center-for-threat-informed-defense/attack-workbench-frontend/). | :x: | :white_check_mark: |
+| Added a [collection index](https://github.com/center-for-threat-informed-defense/attack-workbench-frontend/blob/master/docs/collections.md) to list the contents of this repository and to allow the data to be imported into [ATT&CK Workbench](https://github.com/center-for-threat-informed-defense/attack-workbench-frontend/). | :x: | :white_check_mark: |