doc: Some issue templates

Author: CREAsTIVE

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: ''
+labels: enhancement
+assignees: ''
+
+---
+
+**Is your feature request related to a problem?**
+
+**Describe the solution you'd like**
+A clear and concise description of what you want to happen.
+
+**Describe alternatives you've considered**
+A clear and concise description of any alternative solutions or features you've considered.
+
+**Additional context**
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/language-bug.md

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+---
+name: Language Bug
+about: Any bug of compiler / interpritator
+title: ''
+labels: bug
+assignees: ''
+
+---
+
+### Bug description
+Something went wrong :(
+
+**Platform**: Web / Shell / Any