Add github bug report template [skip ci]

.github/ISSUE_TEMPLATE/bug_report.md

@@ -0,0 +1,40 @@
+---
+name: "\U0001F41E Bug Report"
+about: "Report a bug if something isn't working as expected in Telegram Messenger for iOS."
+title: ""
+labels: bug
+assignees: ""
+---
+
+<!-- Thanks for reporting issues of Telegram Messenger for iOS! 
+This is a bug report template. Please, be as descriptive as possible. Issues lacking detail, or for any other reason than to report a bug, may be closed without action.
+
+First, complete the checklist by replacing the empty checkboxes [] with checked ones [x]. -->
+
+### Checklist
+- [ ] I am reporting an issue in existing functionality that does not work as intended
+- [ ] I've searched for existing [GitHub issues](https://github.com/telegrammessenger/Telegram-iOS/issues)
+
+### Description
+Describe the issue that you are experiencing
+
+### Expected Behavior
+Tell us what should happen
+
+### Actual Behavior
+Tell us what happens instead
+
+### Steps to Reproduce
+1. 
+2. 
+3. 
+
+### Screenshots and Videos 
+Remove, if not applicable
+
+### Environment
+**Device:** `iPhone/iPad X`
+
+**iOS version**: `13.X`
+
+**App version:** `5.X`