Initial import of the CBDDC codebase with docs and tests. Add a .NET-focused gitignore to keep generated artifacts out of source control.

src/ZB.MOM.WW.CBDDC.Core/Diagnostics/ICBDDCHealthCheck.cs

@@ -0,0 +1,15 @@
+using System.Threading;
+using System.Threading.Tasks;
+
+namespace ZB.MOM.WW.CBDDC.Core.Diagnostics
+{
+    public interface ICBDDCHealthCheck
+    {
+        /// <summary>
+        /// Performs a health check for the implementing component.
+        /// </summary>
+        /// <param name="cancellationToken">Cancellation token.</param>
+        /// <returns>The resulting health status.</returns>
+        Task<HealthStatus> CheckAsync(CancellationToken cancellationToken = default);
+    }
+}