[docs] add issue template

docs/issuetemplate/issuetemplate.md

@@ -0,0 +1,17 @@
+When you suspect there is an issue in Thunder for which you would like assistance please use the below template to report the issue.
+
+- Symptom (e.g. segmentation fault, hang-up/unresponsive, assert)
+- Thunder hash the issue is observed on (and if relevant RDKServices hash and/or hash of any other plugin that plays a role in the reproduction scenario)
+- Urgency (low, medium, high) and if medium/high reason for this urgency
+- Jira issue(s) already created that are relevant for the issue 
+- Which component is suspected to cause this (if known provide the process including its startup parameters)
+- If possible a callstack the moment the issue happened of all threads
+- If possible a memory usage overview of the device the moment the issue happened (e.g using top)
+- Detailed Description of the issue
+- Reproduction scenario of the issue on a device with a minimal setup (e.g. Thunder with a maximum of one or two plugins) and using a Thunder build without any patches and also no patches on any other code, e.g. plugins). Including:
+  - build steps if relevant (preferably a build we can reproduce ourselves, but also info on build settings like debug or release, optimization level etc. Anything that is relevant)
+  - device if relevant (ideally it can be reproduced on any device, e.g. RPi)
+  - detailed reproduction scenario describing the steps to take in what order and the symptoms of the issue to observe
+- Whom to contact in case of questions
+- any other info that could be relevant
+

mkdocs.yml

@@ -68,6 +68,7 @@ nav:
   - Misc:
     - Documentation: docs.md
     - References: references/references.md
+    - Filing an Issue: issuetemplate/issuetemplate.md
 
 
 markdown_extensions: