Add support for DEFAULT_ORG_MEMBER_VISIBLE (#7669)

* Add support for DEFAULT_ORG_MEMBER_VISIBLE

* Correct formatting

* Improved description in cheat sheet.

* Add test for DefaultOrgMemberVisible

* Remove dead code

models/org.go

@@ -12,6 +12,7 @@ import (
 	"strings"
 
 	"code.gitea.io/gitea/modules/log"
+	"code.gitea.io/gitea/modules/setting"
 	"code.gitea.io/gitea/modules/structs"
 
 	"github.com/go-xorm/xorm"
@@ -480,8 +481,9 @@ func AddOrgUser(orgID, uid int64) error {
 	}
 
 	ou := &OrgUser{
-		UID:   uid,
-		OrgID: orgID,
+		UID:      uid,
+		OrgID:    orgID,
+		IsPublic: setting.Service.DefaultOrgMemberVisible,
 	}
 
 	if _, err := sess.Insert(ou); err != nil {