Update issue templates

.github/ISSUE_TEMPLATE/add-language.md

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+---
+name: Add language
+about: Add support for new language
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!--- vim-polyglot accepts only lightweight, maintained github-hosted vim plugins -->
+
+**GitHub repository url**
+
+
+**Is this plugin well maintained?**
+
+
+**Is this plugin lightweight? (no advanced functionality, just indent and syntax support)**

.github/ISSUE_TEMPLATE/add-support-for-language.md

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+---
+name: Add support for language
+about: ''
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+**Is your feature request related to a problem? Please describe.**
+A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]
+
+**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/bug_report.md

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+---
+name: Bug report
+about: Report vim-polyglot bug
+title: ''
+labels: ''
+assignees: ''
+
+---
+
+<!-- Vim-polyglot is not responsible for bugs of plugins it uses. Please report only bugs that happen when plugin is used as part of vim-polyglot and doesn't happen when just install the plugin -->
+
+**Does this bug happen when you install plugin without vim-polyglot?**
+
+**Describe the bug:**
+
+**To Reproduce:**