add notice for the issue templates

.github/ISSUE_TEMPLATE/bug-report.md

@@ -6,6 +6,8 @@ labels: bug
 assignees: ''
 
 ---
+<!-- PLEASE FILL THESE FIELDS, IT REALLY HELPS THE MAINTAINERS OF SEARX -->
+
 **Version of Searx, commit number if you are using on master branch and stipulate if you forked Searx**
 <!-- If you are running on master branch using git execute this command
 in order to fetch the latest commit ID:
@@ -34,4 +36,4 @@ or manually by executing the searx/webapp.py file? -->
 <!-- If applicable, add screenshots, logs to help explain your problem. -->
 
 **Additional context**
-<!-- Add any other context about the problem here. -->
+<!-- Add any other context about the problem here. -->

.github/ISSUE_TEMPLATE/engine-request.md

@@ -6,6 +6,8 @@ labels: enhancement, engine request
 assignees: ''
 
 ---
+<!-- PLEASE FILL THESE FIELDS, IT REALLY HELPS THE MAINTAINERS OF SEARX -->
+
 **Working URL to the engine**
 <!-- Please check if the engine is responding correctly before submitting it. -->
 
@@ -26,4 +28,4 @@ general, files, images, it, map, music, news, science, social media and videos.
 You can add multiple categories at the same time. -->
 
 **Additional context**
-<!-- Add any other context about this engine here. -->
+<!-- Add any other context about this engine here. -->

.github/ISSUE_TEMPLATE/feature-request.md

@@ -6,6 +6,8 @@ labels: enhancement
 assignees: ''
 
 ---
+<!-- PLEASE FILL THESE FIELDS, IT REALLY HELPS THE MAINTAINERS OF SEARX -->
+
 **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 [...] -->
 
@@ -16,4 +18,4 @@ assignees: ''
 <!-- A clear and concise description of any alternative solutions or features you've considered. -->
 
 **Additional context**
-<!-- Add any other context or screenshots about the feature request here. -->
+<!-- Add any other context or screenshots about the feature request here. -->