[csharp] Add GenHTTP framework (#7984)

* Add GenHTTP framework

* Convert /user to POST

* Switch to wildcard for minor version of package references

csharp/genhttp/Program.cs

@@ -0,0 +1,14 @@
+using GenHTTP.Engine.Kestrel;
+using GenHTTP.Modules.Functional;
+
+var empty = "";
+
+var app = Inline.Create()
+                .Get(() => empty)
+                .Get("/user/:id", (string id) => id)
+                .Post("/user", () => empty);
+
+return await Host.Create()
+                 .Handler(app)
+                 .Port(3000)
+                 .RunAsync();

csharp/genhttp/config.yaml

@@ -0,0 +1,3 @@
+framework:
+  github: Kaliumhexacyanoferrat/GenHTTP
+  version: 9.1

csharp/genhttp/web.csproj

@@ -0,0 +1,20 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+
+    <TargetFramework>net8.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <AssemblyName>web</AssemblyName>
+    <OutputType>Exe</OutputType>
+
+    <ServerGarbageCollection>true</ServerGarbageCollection>
+    <TieredPGO>true</TieredPGO>
+
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="GenHTTP.Core.Kestrel" Version="9.1.*" />
+    <PackageReference Include="GenHTTP.Modules.Functional" Version="9.1.*" />
+  </ItemGroup>
+
+</Project>

reviewers.yaml

@@ -196,6 +196,8 @@ csharp:
     - jchannon
   simplify.web:
     - i4004
+  genhttp:
+    - Kaliumhexacyanoferrat
 cpp:
   drogon:
     - an-tao