docs: update readme to include license and copyright (tari-project#220)

Description
Read me updated to include license and copyright notice.

Motivation and Context
The original readme was a project default.

How Has This Been Tested?
Reviewed forked repo readme page.

What process can a PR reviewer use to test or verify this change?
Review branch readme page.

Breaking Changes

- [x] None
- [ ] Requires data directory on base node to be deleted
- [ ] Requires hard fork
- [ ] Other - Please specify

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Co-authored-by: stringhandler <[email protected]>