chore: 🤖 stale bot config

.github/ISSUE_TEMPLATE/Ad_report.md

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+---
+name: Issue report
+about: Report an issue with AdGuard Filters
+---
+
+[//]: # (***You can delete or ignore strings starting with "[//]:" They will not be visible either way.)
+
+***Description***:
+* **Current behaviour**: 
+
+[//]: # (Substitute this line with a description of the problem)
+
+[//]: # (Replace %screenshot_url% below with a link to the screenshot of the problem. Also, you can paste image from clipboard instead. It will be automatically loaded.)
+<details><summary>Screenshot:</summary>
+
+![image](%screenshot_url%)
+</details><br/>
+
+* **Expected behaviour**: 
+
+[//]: # (Substitute this line with a description of what should happen normally. If needed, provide a screenshot below, same as above)
+
+<details><summary>Screenshot:</summary>
+
+![image](%url_of_screenshot%)
+</details><br/>
+
+***Steps to reproduce the problem***:
+
+[//]: # (Substitute this line with a step-by-step instruction how to reproduce the issue)
+
+***System configuration***
+
+**Filters:**
+
+[//]: # (Substitute this line with the list of your active filters, separated by commas)
+
+[//]: # (Please enter the correct values for your case to the table below)
+
+Information                            | Value
+---                                    | ---
+Operating system:                      | ?
+Operating system version (Android/iOS) | ?
+Browser:                               | ?
+AdGuard version:                       | ?
+Filters enabled:                       | ?
+AdGuard mode (Android only):           | VPN / Proxy (manual/auto)
+Filtering quality (Android only):      | High-quality / High-speed / Simplified
+HTTPS filtering (Android only):        | On (Default/Blacklist mode) / Off
+Simplified filters (iOS only)          | On / Off
+AdGuard DNS:                           | None / Default / Family Protection
+Stealth mode options (Windows only)    | ?
+Helpdesk ID (if exists):               | ?
+
+[//]: # (This template is meant for missed ad/false positive reports, for other type of reports edit it accordingly)
+[//]: # (If this is a crash report, include the crashlog with https://gist.github.com/)

.github/ISSUE_TEMPLATE/Feature_request.md

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+---
+name: Feature request
+about: Suggest an idea for AdGuard Filters
+---
+
+### Prerequisites
+
+Please answer the following questions for yourself before submitting an issue. **YOU MAY DELETE THE PREREQUISITES SECTION.**
+
+- [ ] I checked the documentation and found no answer
+- [ ] I checked to make sure that this issue has not already been filed
+
+### Problem Description
+
+<!-- Is your feature request related to a problem? Please add a clear and concise description of what the problem is. -->
+
+### Proposed Solution
+
+<!-- Describe the solution you'd like in a clear and concise manner -->
+
+### Alternatives Considered
+
+<!-- A clear and concise description of any alternative solutions or features you've considered. -->
+
+### Additional Information
+
+<!-- Add any other context about the problem here. -->

.github/stale.yml

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+# Number of days of inactivity before an issue becomes stale
+daysUntilStale: 60
+# Number of days of inactivity before a stale issue is closed
+daysUntilClose: 3
+# Issues with these labels will never be considered stale
+exemptLabels:
+  - 'A: By design'
+  - 'A: In progress'
+  - 'Problematic'
+# Label to use when marking an issue as stale
+staleLabel: "A: Won't fix"
+# Comment to post when marking an issue as stale. Set to `false` to disable
+markComment: >
+  This issue has been automatically marked as stale because it has not had
+  recent activity. It will be closed if no further activity occurs. Thank you
+  for your contributions.
+# Comment to post when closing a stale issue. Set to `false` to disable
+closeComment: false