[gnome-builder] .gitlab: add feature issue template

[Christian Hergert <chergert src gnome org>]

commit 9f03eb90fc5d0c5f704268f8ad51ee60727a8671
Author: Stan Grupp <fedora-topics-562353 protonmail com>
Date:   Sun Jul 31 21:04:01 2022 +0000

    .gitlab: add feature issue template

 .gitlab/issue_templates/Feature.md | 7 +++++++
 1 file changed, 7 insertions(+)
---
diff --git a/.gitlab/issue_templates/Feature.md b/.gitlab/issue_templates/Feature.md
new file mode 100644
index 000000000..2a524c16d
--- /dev/null
+++ b/.gitlab/issue_templates/Feature.md
@@ -0,0 +1,7 @@
+# Ideas for new features are welcome!
+
+Please share your feature ideas in our Discourse in order to discuss them with our community:
+
+https://discourse.gnome.org/tag/builder
+
+Quite some evaluation plus refinement has to happen between an idea and creating an actual and detailed plan 
for a potential implementation. We found that they develop into actionable issues best when they are 
discussed beforehand.