Prepare for prioritize issues & update .gitignore for goland users (#117)

Prepare for Prioritize issues & update .gitignore for goland users.
Target on the [Issue](https://github.com/go-gitea/gitea/issues/2616)

Signed-off-by: BetaCat0 <outman99@hotmail.com>

gitea/issue.go

@@ -152,3 +152,9 @@ type IssueDeadline struct {
 	// swagger:strfmt date-time
 	Deadline *time.Time `json:"due_date"`
 }
+
+// EditPriorityOption options for updating priority
+type EditPriorityOption struct {
+	// required:true
+	Priority int `json:"priority"`
+}