add Feature.md GitLab issue template

Signed-off-by: Kevin Morris <kevr@0cost.org>

.gitlab/issue_templates/Feature.md

+- [ ] I have summed up the feature in concise words in the [Summary](#summary) section.
+- [ ] I have completely described the feature in the [Description](#description) section.
+- [ ] I have completed the [Blockers](#blockers) section.
+
+### Summary
+
+Fill this section out with a concise wording about the feature being
+requested.
+
+Example: _A new `Tyrant` account type for users_.
+
+### Description
+
+Describe your feature in full detail.
+
+Example: _The `Tyrant` account type should be used to allow a user to be
+tyrannical. When a user is a `Tyrant`, they should be able to assassinate
+users due to not complying with their laws. Laws can be configured by updating
+the Tyrant laws page at https://aur.archlinux.org/account/{username}/laws.
+More specifics about laws._
+
+### Blockers
+
+Include any blockers in a list. If there are no blockers, this section
+should be omitted from the issue.
+
+Example:
+
+- [Feature] Do not allow users to be Tyrants
+    - \<(issue|merge_request)_link\>