Add EPIC.md issue template.

.gitlab/issue_templates/Epic.md

@@ -0,0 +1,42 @@
+ Current problems
+ <!--
+ What are the problems that the current project has?
+
+ For example:
+ * User cannot use the keyboard to perform most common actions
+ or
+ * User cannot see documents from cloud services
+ -->
+
+ # Goals & use cases
+ <!--
+ What are the use cases that this proposal will cover? What are the end goals?
+
+ For example:
+ * User needs to share a file with their friends.
+ or
+ * It should be easy to edit a picture within the app.
+ -->
+
+ # Requirements
+ <!--
+ What does the solution needs to ensure for being succesful?
+
+ For example:
+ * Work on small form factors and touch
+ or
+ * Use the Meson build system and integrate with it
+ -->
+
+ # Relevant art
+ <!--
+ Is there any product that has implemented something similar? Put links to other
+ projects, pictures, links to other code, etc.
+ -->
+
+ # Proposal & plan
+ <!-- What's the solution and how should be achieved? It can be split in smaller
+ tasks of minimum change, so they can be delivered across several releases. -->
+
+ /label ~"Epic"
+