Add Enhancement template

# Proposers

- name-of-proposer-1 (institution-of-proposer-1)

- name-of-proposer-2 (institution-of-proposer-2)

...

# Description

Describe your proposal in ~1000 characters.

You can reference external content listed in section "References" as [Ref-1].

# Demo or definition of done

Describe which high level conditions needs to be fulfilled to demonstrate this feature implementation is completed.

You can reference external content (example, demo paper) listed in section "References" as [Ref-2].

# References

1. [Reference name](https://reference-url)

2. Author1, Author2, Author3, et. al., “My demo using feature,” in Conference-Name Demo Track, 20XX.