templates: add issue templates (#276)

.github/ISSUE_TEMPLATE/bug_report.md

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+---
+name: Bug report
+about: Create a report to help us improve
+title: "[BUG]"
+labels: bug
+assignees: ''
+
+---
+
+- [ ] I am reporting a bug.
+- [ ] I am running the latest version of BDfR
+- [ ] I have read the [Opening an issue](README.md#configuration)
+  
+## Description
+A clear and concise description of what the bug is.
+
+## Command
+```
+Paste here the command(s) that causes the bug
+```
+
+## Environment (please complete the following information):
+ - OS: [e.g. Windows 10]
+ - Python version: [e.g. 3.9.4]
+
+## Logs
+```
+Paste the log output here.
+```

.github/ISSUE_TEMPLATE/feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for this project
+title: "[FEATURE]"
+labels: ''
+assignees: ''
+
+---
+
+- [ ] I am requesting a feature.
+- [ ] I am running the latest version of BDfR
+- [ ] I have read the [Opening an issue](README.md#configuration)
+  
+## Description
+Clearly state the current situation and issues you experience. Then, explain how this feature would solve these issues and make life easier. Also, explain the feature with as many detail as possible.

.github/ISSUE_TEMPLATE/site-support-request.md

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+---
+name: Site Support request
+about: Describe this issue template's purpose here.
+title: "[SITE]"
+labels: ''
+assignees: ''
+
+---
+
+- [ ] I am requesting a site support.
+- [ ] I am running the latest version of BDfR
+- [ ] I have read the [Opening an issue](README.md#configuration)
+  
+## Site
+Provide a URL to domain of the site.
+
+## Example posts
+Provide example reddit posts with the domain.