Show detailed information about issue in popup/float window.

[skanehira]

👔 Overview

Show detailed information about issue in popup/float window.

👖 How to achieve

Use K(default key) to show detaul information that have to contains assignees, labels and body.

The UI bellow is basic design in my mind.
NOTE: | is cursor.

#19 Show |detailed information about issue in popup/float window. OPEN @skanehira (enhancement) 
         +-issue body--------+-assignees---+
         | # title           | skanehira   |
         | this is issu body | gorilla     |
         | ...               | ...         |
         |                   +-labels------|
         |                   | bug         |
         |                   | docs        |
         |                   | ...         |
         +-------------------+-------------+

🧦 Steps

1. Open issue list buffer.
2. Type K to show detailed information about the issue under the cursor