Firebase Admin .NET SDK v1.0.0

• [added] Initial release of the Admin .NET SDK. See Add the Firebase Admin SDK to your Server to get started.
• [added] You can configure the SDK to use service account credentials, user credentials (refresh tokens), or Google Cloud application default credentials to access your Firebase project.

Authentication

• [added] The initial release includes the CreateCustomTokenAsync(), and VerifyIdTokenAsync() methods for minting custom authentication tokens and verifying Firebase ID tokens.