add discussions template (#2444)

.github/DISCUSSION_TEMPLATE/questions.yml

@@ -0,0 +1,16 @@
+body:
+
+  - type: textarea
+    attributes:
+      label: Question
+    validations:
+      required: true
+
+  - type: markdown
+    attributes:
+      value: |
+        Note: If you are asking for help because you're having trouble doing something, provide enough informations to replicate the problem. In particular, include in the question:
+
+        * the server version you are using
+        * precise instructions on how to replicate the problem
+        * server logs with setting `logLevel` set to `debug`

.github/ISSUE_TEMPLATE/config.yml

@@ -2,5 +2,5 @@ blank_issues_enabled: false
 
 contact_links:
   - name: Question
-    url: https://github.com/bluenviron/mediamtx/discussions/new
+    url: https://github.com/bluenviron/mediamtx/discussions/new?category=questions
     about: Ask the community for help