Add ZeroQL C# client

src/content/code/language-support/c-net/client/zeroql.md

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+---
+name: ZeroQL
+description: ZeroQL is a open-source GraphQL client for C# 
+url: https://github.com/byme8/ZeroQL
+github: byme8/ZeroQL
+---
+
+The ZeroQL is a high-performance C#-friendly GraphQL client. It supports Linq-like syntax, and doesn't require Reflection.Emit or expressions.
+As a result, at runtime provides performance very close to a raw HTTP call.
+
+You can use ZeroQL to:
+
+- Generate a C# client from GraphQL schema.
+- Generate and execute graphql queries from your C# code.
+- Don't require writing GraphQL manually.
+
+```csharp
+var response = await client.Query(o => o.Me(o => new { o.Id, o.FirstName, o.LastName }));
+```