Add issue templates

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Report a bug you have encountered
+title: "[BUG] "
+labels: bug
+assignees: ''
+
+---
+
+## Describe the bug
+A clear and concise description of what the bug is.
+
+## Reproducing the issue
+Please provide a clear and and minimal description of how to reproduce the bug.
+If possible, provide a simple example configuration that shows the issue.
+
+## Expected behaviour
+A clear and concise description of what you expected to happen.
+
+## Additional context
+If applicable, provide additional context or screenshots here

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: "[FEATURE] "
+labels: enhancement
+assignees: ''
+
+---
+
+## Description of the requested feature
+Give a clear and concise description of the feature you are proposing, including examples for when it would be useful.
+
+## Proposed configuration syntax
+If the feature you are requesting would add or change something to the Eww configuration, please provide an example for how the feature could be used.
+
+# Additional context
+Add any other context or screenshots about the feature request here.

.github/ISSUE_TEMPLATE/widget-request.md

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+---
+name: Widget request
+about: Request a new Widget
+title: "[WIDGET] "
+labels: widget-request
+assignees: ''
+
+---
+
+## Description of the widget
+Provide an explanation of the widget.
+
+## Implementation proposal
+If applicable, describe which GTK-widgets this widget would be based on. A gallery of GTK widgets can be found [here](https://developer.gnome.org/gtk3/stable/ch03.html).
+
+Please include links to the respective GTK documentation pages.
+
+## Example usage
+Provide an example snippet of configuration showcasing how the widget could be used, including the attributes the widget should support.
+For anything non-obvious, include an explanation of how the properties should behave.
+
+## Additional Context
+Provide any additional context if applicable.