Add contribution templates

ISSUE_TEMPLATE.md

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+Thanks for helping out! 😇
+
+### Prerequisites
+
+If it's a bug on the **website**, submit an issue on the appropriate repository: [https://github.com/jgthms/bulma-website](https://github.com/jgthms/bulma-website)
+
+* [ ] Is this about Bulma the **CSS framework** and **not** about the Bulma website?
+* [ ] Which **version** of Bulma are you using?
+* [ ] Which **browser** are you using?
+* [ ] If it's a **Sass** issue, which version of Sass are you using?
+* [ ] Are you sure this issue is not a **duplicate**?
+
+### Description
+
+[Description of the bug, enhancement, or question]
+[Please tag accordingly]
+
+### Steps to Reproduce
+
+1. [First Step]
+2. [Second Step]
+3. [and so on...]
+
+_Expected behavior:_ [What you expected to happen]
+
+_Actual behavior:_ [What actually happened]
+
+**Screenshots** are more than welcome!