Add the `Issue` type

issue.go

@@ -0,0 +1,24 @@
+package jiraclient
+
+import "fmt"
+
+type Issue struct {
+	Id     string `json:"id"`
+	Self   string `json:"self"`
+	Key    string `json:"key"`
+	Fields struct {
+		Summary     string  `json:"summary"`
+		Creator     User    `json:"creator"`
+		Reporter    User    `json:"reporter"`
+		Assignee    User    `json:"assignee"`
+		Description string  `json:"description"`
+		Project     Project `json:"project"`
+		Comment     struct {
+			Comments []Comment `json:"comments"`
+		} `json:"comment"`
+	} `json:"fields"`
+}
+
+func (i Issue) String() string {
+	return fmt.Sprintf("%s %s", i.Key, i.Fields.Summary)
+}