Update LICENSE and Add NOTICE

[tenthirtyam]

Update LICENSE 3c5a834

• Added header for terraform-provider-vra
• Added copyright notice from initial to current release years (2019-2021).

Add NOTICE 3c09b38

• Includes header for terraform-provider-vra
• Includes copyright notice from initial to current release years (2019-2021).
• Includes reference to licensing.

[vmwclabot]

@tenthirtyam, you must sign every commit in this pull request acknowledging our Developer Certificate of Origin before your changes are merged. This can be done by adding Signed-off-by: John Doe <john.doe@email.org> to the last line of each Git commit message. The e-mail address used to sign must match the e-mail address of the Git author. Click here to view the Developer Certificate of Origin agreement.

• Commit 3c5a834c2941a3b5d0d4916e10aa6d450fb5fadf must be signed by ryan@tenthirtyam.org
• Commit 3c09b388eb1130873013b3050e9039748f06dfe0 must be signed by ryan@tenthirtyam.org