Naver Cloud

Added Sonar app manifest.

Fixed a bug where the ncloud-monthly-costs-by-contract command would fail due to an null defaultAmount value.

First release. Support following commands:

• ncloud-access-control-group-rules: Get rule list of access control groups from Naver Cloud.
• ncloud-access-control-groups: Get ACG list from Naver Cloud.
• ncloud-activities: Get cloud activity logs from Naver Cloud.
• ncloud-monthly-costs-by-contract: Get monthly costs by contract from Naver Cloud.
• ncloud-monthly-costs-by-product: Get monthly costs by product from Naver Cloud.
• ncloud-network-acls: Get network ACLs from Naver Cloud.
• ncloud-regions: Get regions from Naver Cloud.
• ncloud-servers: Get server instances from Naver Cloud.
• ncloud-sub-accounts: Get sub accounts from Naver Cloud.
• ncloud-subnets: Get subnets from Naver Cloud.
• ncloud-vpcs: Get VPCs from Naver Cloud.
• ncloud-zones: Get zones from Naver Cloud.