Added note about screenshots to bug_report.md

Author: FeodorFitsner

.github/ISSUE_TEMPLATE/bug_report.md

@@ -3,6 +3,19 @@ name: Bug report
 about: Create a report to help us improve Flet
 ---
 
+<!--
+=============================================================================
+============================== IMPORTANT NOTE ===============================
+=============================================================================
+
+DO NOT PASTE SCREENSHOTS OF LOGS OR ERRORS INSTEAD OF A TEXT PLEASE!
+
+When you paste screenshots into issue instead of text a) it's impossible to copy/paste to google - everything has to be re-typed by hands and b) the contents of the issue is not indexed by search engines, so other users won't find the issue and solution.
+
+Thank you!
+
+-->
+
 <!--
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