Add legal documentation
see: eclipsefdn/emo-team/emo#644 (closed)
Required files:
- 
License files in all repository roots  - 
README  - 
CONTRIBUTING (or equivalent)  
Recommended files:
- 
NOTICES or equivalent (you can use the Legal Documentation generator available under committer tools)  - 
CODE_OF_CONDUCT  - 
SECURITY  
See examples for Security file and Code of Conduct.
Required elements:
- 
ECA is referenced/described  
Recommended elements:
- 
Security policy is described  
Edited  by Alexander Fedorov