Added missing copyright file headers to the CQL c-sharp code.
/*
* Copyright (c) 2024, NCQA and contributors
* See the file CONTRIBUTORS for details.
*
* This file is licensed under the BSD 3-Clause license
* available at https://raw.githubusercontent.com/FirelyTeam/firely-cql-sdk/main/LICENSE
*/
ℹ️Work for issue #321 ⏮️PR #320 ⏭️PR #323
Added missing copyright file headers to the CQL c-sharp code.