Add Makefile / .drone.yml, use go module with vendor (#20)

* add Makefile / .drone.yml, use go module with vendor

* Update .drone.yml

Co-Authored-By: lunny <xiaolunwen@gmail.com>

vendor/code.gitea.io/sdk/gitea/org_member.go

@@ -0,0 +1,26 @@
+// Copyright 2016 The Gogs Authors. All rights reserved.
+// Use of this source code is governed by a MIT-style
+// license that can be found in the LICENSE file.
+
+package gitea
+
+import (
+	"bytes"
+	"encoding/json"
+	"fmt"
+)
+
+// AddOrgMembershipOption add user to organization options
+type AddOrgMembershipOption struct {
+	Role string `json:"role" binding:"Required"`
+}
+
+// AddOrgMembership add some one to an organization's member
+func (c *Client) AddOrgMembership(org, user string, opt AddOrgMembershipOption) error {
+	body, err := json.Marshal(&opt)
+	if err != nil {
+		return err
+	}
+	_, err = c.getResponse("PUT", fmt.Sprintf("/orgs/%s/membership/%s", org, user), jsonHeader, bytes.NewReader(body))
+	return err
+}