Update issue template

[ci skip]

.github/ISSUE_TEMPLATE.md

@@ -5,6 +5,7 @@ If you want to request a feature or ask a question, feel free to remove all the
 ### System:
 
 - Nheko commit/version:
+- Installation method: <!-- AppImage, some repository, local build etc -->
 - Operating System:
 - Qt version:
 - C++ compiler:
@@ -16,5 +17,20 @@ If you want to request a feature or ask a question, feel free to remove all the
 
 ### Steps to reproduce
 
-<!-- If the program crashed. -->
+<!-- 
-### Debugger traceback 
+If the program crashed send a backtrace:
+
+You can retrieve a backtrace by building nheko with -DCMAKE_BUILD_TYPE=Debug
+and running it through gdb or lldb.
+
+gdb ./build/nheko
+
+>> run
+
+... Make the program crash
+
+>> bt
+
+... Paste a link of the output below (Use a pastebin, don't paste the text).
+-->
+### Debugger backtrace