Add members to group feature

[emilvincentz]

Mockup:
https://www.figma.com/file/ww9GF90BJOJGKxlaYq3f8r/Upcoming-Features?node-id=0%3A1

User Goal :
The goal of the user is to be able to onboard their new members with an easier flow - without having to send emails to each member separately to add them into a group.
The goal of the user is also to add new members to a group from an Acter directly without the email invite.

User Stories:

• As an admin of group A and group B , I'd like to be able to add all/other members of group B to group A in order to speed up our onboarding and internal organisation on Acter platform.

• As an admin of a group A I want to be able to directly add members from the community ( the group is part of )to group A

• An admin of a group doesn’t have to be admin of the community ( where the group is), to be able to add members from the community to the group.

Permutations :
SCENARIO 1

Scenario - As an Admin of group B and group A, I would like to to add all group B members to group A.

Given that I am an admin of group B and group A , when I click on the members of group A I wanna be able to type in the #groupname B then add all members of that group into group A. Then the new members I added will automatically appear under members.

SCENARIO 2

Scenario - As an Admin of group A, I would like to directly add new members to group A.

Given that I am an admin of group A , when I click on the members I wanna be able to add new members by writing their name and selecting from a dropdown. Then the new members I added will automatically appear under members.