NO-ISSUE Add a pull request template (#20)

## Description

As the title.

Reviewed-on: #20
Co-authored-by: SquidSpirit <squid@squidspirit.com>
Co-committed-by: SquidSpirit <squid@squidspirit.com>

.gitea/PULL_REQUEST_TEMPLATE.yaml

@@ -0,0 +1,36 @@
+name: Pull Request Template
+about: Use this template for creating a pull request
+
+body:
+  - type: textarea
+    id: description
+    attributes:
+      label: Description
+    validations:
+      required: true
+
+  - type: textarea
+    id: package
+    attributes:
+      label: Package Changes
+      description: List the packages changed in this PR
+
+  - type: textarea
+    id: screenshots
+    attributes:
+      label: Screenshots
+
+  - type: textarea
+    id: reference
+    attributes:
+      label: Reference
+      placeholder: "Resolves #ISSUE_NUMBER"
+    validations:
+      required: true
+
+  - type: checkboxes
+    id: checklist
+    attributes:
+      label: Checklist
+      options:
+        - label: A milestone is set