Add 1.6.0 Schema File (#1855)
Add 1.6.0 Schema File (#1855)

No schema changes since 1.5.0, so 1.6.0 section is empty in the file.

Co-authored-by: Bogdan Drutu <3f8e17047c2434e5c82a61403e56b9ef3e226d99@gmail.com>
open-telemetry/opentelemetry-specification,open-telemetry/opentelemetry-specification