Create pull_request_template.md (#117766)

.github/pull_request_template.md

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+### Please include a summary of the change and which issue is fixed.
+### If the related issue does not exist in our repository, please create it before making pool request.
+### It is highly recommended to use our [Web Reporting Tool](https://kb.adguard.com/en/technical-support/reporting-tool) instead of creating an issue on GitHub directly.
+### Please note, that we verify every pull request manually, so it may take time to apply it.
+
+---
+
+
+### Prerequisites
+##### To avoid invalid pull requests, please check and confirm following checkboxes:
+
+        
+  - [ ] This is not an ad/bug report;
+  - [ ] My code follows the [guidelines](https://github.com/AdguardTeam/AdguardFilters/blob/master/CONTRIBUTING.md) and [syntax](https://kb.adguard.com/general/how-to-create-your-own-ad-filters) of this project;
+  - [ ] I have performed a self-review of my own changes;
+  - [ ] My changes do not break web sites, apps and files structure.
+
+### What problem does the pull request fix?
+##### If the problem does not fall under any category that is listed here, please contact our tech support: `support@adguard.com`
+
+  - [ ] Missed ads or ad leftovers;
+  - [ ] Website or app doesn't work properly;
+  - [ ] AdGuard gets detected on a website;
+  - [ ] Missed analytics or tracker;
+  - [ ] Social media buttons — share, like, tweet, etc;
+  - [ ] Annoyances — pop-ups, cookie warnings, etc.
+  
+### What issue is being fixed?
+##### Enter the issue address:
+
+Example: https://github.com/AdguardTeam/AdguardFilters/issues/100000
+
+### Add your comment and screenshots
+##### If possible, a screenshot of a page or application should not be cropped too much. Otherwise, it is not always clear where the element is located.
+
+**0.** **DO NOT** upload screenshots with sexually explicit material on GitHub directly. Instead, upload it to a third-party image hosting and post the link to it without preview (!) here. Also, mention if the link leads to NSFW content;
+
+**1.** Add screenshots of the problem. You can drag and drop images or paste them from clipboard;
+
+Use `<details> </details>` tag to hide screenshots under the spoiler; 
+
+**2.** Describe the issue in detail until it is absolutely clear from the screenshot what the problem is;
+
+You can also indicate any other information that you think the developers should know.
+
+**Warning:** Please remove personal information before uploading screenshots!
+
+
+**1.** `Write a comment here`
+
+**2.** Screenshots
+
+<details><summary>Screenshot 1:</summary>
+
+<!-- paste screenshot here -->
+
+</details>
+
+<details><summary>Screenshot N:</summary>
+
+<!-- paste screenshot here -->
+
+</details>
+
+
+
+
+### Terms
+
+  - [ ] By submitting this issue, I agree that pull request does not contain private info and all conditions are met.