Initial commit.

- Created and set up main projects
- Created classes for Domain

PhonebookService.Api/appsettings.json

@@ -0,0 +1,9 @@
+{
+	"Logging": {
+		"LogLevel": {
+			"Default": "Information",
+			"Microsoft.AspNetCore": "Warning"
+		}
+	},
+	"AllowedHosts": "*"
+}