Add ISSUE_TEMPLATE.md

[co-robo]

Add a file named ISSUE_TEMPLATE.md which includes general information and guidelines for issue reporter, you can see ISSUE_TEMPLATE.md of coala repository for reference.
label: initiatives/gci
Opened by @Monal5031 at gitter//Monal5031

[jayvdb]

The most important information needed for an issue in this repo is either:

• the cEP the issue relates to, or
• is the issue requesting a new cEP.

[CyberDrudge]

@jayvdb can i work on this?