add github ISSUE_TEMPLATE files

[cliffordfajardo]

What is the change?

1. Add bug_report.md to enable Github's form based issue template
   • https://youtu.be/qQE1BUkf2-s?t=23
2. added config.yml file to help direct users to the helpful pages

Motivation

• encourage's bug reporter's to put more care into their bug report before submission
• this may help maintainer's receive more detailed & higher quality bug report's
• adds helpful tips for user's during the process of creating a bug/issue report

Demo of Change

this PR is similar to this one I created here for another repo recently

• https://github.com/antvis/G6/blob/master/.github/ISSUE_TEMPLATE/bug_report.yml