update issue templates [skip ci]

Author: VREMSoftwareDevelopment

.github/ISSUE_TEMPLATE/bug_report.md

@@ -6,6 +6,8 @@ about: Create a report to help us improve
 
 [How to report a bug](https://github.com/VREMSoftwareDevelopment/WiFiAnalyzer/wiki/Feedback)
 
+**Please search issues (open and closed) to see the issues has already been reported. **
+
 **Describe the bug**
 A clear and concise description of what the bug is.
 

.github/ISSUE_TEMPLATE/feature_request.md

@@ -4,6 +4,8 @@ about: Suggest an idea for this project
 
 ---
 
+**Please search issues (open and closed) to see the issues has already been reported. **
+
 **Is your feature request related to a problem? Please describe.**
 A clear and concise description of what the problem is. Ex. I'm always frustrated when [...]