'new' keyword disambiguation page (#39370)

* Add 'new' keyword to the keywords page

* List all the 'new' keyword usages in 'new' page

* Remove redirection from new.md

.openpublishing.redirection.csharp.json

@@ -891,10 +891,6 @@
             "source_path_from_root": "/docs/csharp/language-reference/keywords/new-operator.md",
             "redirect_url": "/dotnet/csharp/language-reference/operators/new-operator"
         },
-        {
-            "source_path_from_root": "/docs/csharp/language-reference/keywords/new.md",
-            "redirect_url": "/dotnet/csharp/language-reference/operators/new-operator"
-        },
         {
             "source_path_from_root": "/docs/csharp/language-reference/keywords/object.md",
             "redirect_url": "/dotnet/csharp/language-reference/builtin-types/reference-types"

docs/csharp/language-reference/keywords/index.md

@@ -63,7 +63,7 @@ The first table in this article lists keywords that are reserved identifiers in
     :::column-end:::
     :::column:::
         [`namespace`](namespace.md)  
-        [`new`](../operators/new-operator.md)  
+        [`new`](new.md)  
         [`null`](null.md)  
         [`object`](../builtin-types/reference-types.md)  
         [`operator`](../operators/operator-overloading.md)  

docs/csharp/language-reference/keywords/new.md

@@ -0,0 +1,23 @@
+---
+description: "new - C# Reference"
+title: "new - C# Reference"
+ms.date: 01/02/2024
+f1_keywords:
+  - "new"
+  - "new_CSharpKeyword"
+helpviewer_keywords:
+  - "new keyword [C#]"
+---
+
+# new (C# Reference)
+
+The `new` keyword is used as:
+
+- [new operator](../operators/new-operator.md)
+- [new modifier](new-modifier.md)
+- [new constraint](new-constraint.md)
+
+## See also
+
+- [C# Keywords](index.md)
+- [C# Reference](../index.md)