isotope/.github/issue_template.md

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**Test case:** https://codepen.io/desandro/pen/mEinp
🐱 move contributing, add issue_template, add .github/ 9 years ago			`<!-- Thanks for submitting an issue! All bug reports and problem issues require a reduced test case. Create one by forking any one of the CodePen examples from the docs. See guidelines link above. -->`

🐙 github: remove Coder's Clan; https links 7 years ago			`Test case: https://codepen.io/desandro/pen/mEinp`