Ignore environment-specific appsettings files

Added environment-specific settings to .gitignore.

Author: Virendra-Vyas

.gitignore

@@ -359,5 +359,10 @@ MigrationBackup/
 # Ionide (cross platform F# VS Code tools) working folder
 .ionide/
 
+# Environment-specific settings
+appsettings.Development.json
+appsettings.Production.json
+appsettings.Staging.json
+
 # Fody - auto-generated XML schema
-FodyWeavers.xsd
+FodyWeavers.xsd