[Feature] Create New GitHub Issues from Rocket.Chat

[samad-yar-khan]

Why do we need this ?

As a GitHub App developer

I need to: Create a new-issue feature which calls the GitHub issues API

So That: people can have discussions on recurring issues or feature and raise them directly from Rocket.Chat Channels without switching to GitHub. This can be a time saver.

Acceptance Criteria

• [ ] Add slash command to open a new issues modal with input fields required to create an issue
• [ ] Send Authenticated request to GitHub API to create a new issue
• [ ] Handle edge cases with non authenticated developers
• [ ] Repository owners can Add Assignees and Labels to the issue.

[samad-yar-khan]

@RonLek This issue was created twice #10 . Can you please delete this.