Add Search users support (#92)

Signed-off-by: Serhii Kuts <sergeykuc@gmail.com>

gitea/user_search.go

@@ -0,0 +1,14 @@
+package gitea
+
+import "fmt"
+
+type searchUsersResponse struct {
+	Users []*User `json:"data"`
+}
+
+// SearchUsers finds users by query
+func (c *Client) SearchUsers(query string, limit int) ([]*User, error) {
+	resp := new(searchUsersResponse)
+	err := c.getParsedResponse("GET", fmt.Sprintf("/users/search?q=%s&limit=%d", query, limit), nil, nil, &resp)
+	return resp.Users, err
+}