Add assignees support to Issue template

[jk-nilo]

• Gitea version (or commit ref): 1.13.0
• Git version: n/a
• Operating system: n/a
• Database (use [x]):
  • [ ] PostgreSQL
  • [x] MySQL
  • [ ] MSSQL
  • [ ] SQLite
• Can you reproduce the bug at https://try.gitea.io:
  • [ ] Yes (provide example URL)
  • [x] No
• Log gist:

Description

Add support for assignees in ISSUE_TEMPLATE.md in order to add a user directly when creating an issue from a template. This is supported in GitHub (see docs).

Example of usage: My colleague is also responsible for a server of the product. Issues related to the server will be always assigned to him. This could ease the process of creation of the issue.

Proposed format:

---

name: "Template Name"
about: "This template is for testing!"
title: "[TEST] "
labels:

- bug
- "help needed"

assignees:

- user1

---

This is the template!

Screenshots

[bserem]

While on this, it would be great to add projects as well, so that new issues automatically land on the kanban/columns board.

[pouya-loyall]

is there a light at the end of tunnel? 😊

[lunny]

I don't think it's very hard but nobody is working on this issue.