Added support for C# using dotnet CLI with dotnet script

Author: VariableClass

examples/code_blocks.md

@@ -23,6 +23,7 @@ Currently supported languages:
 * `swift`
 * `dart`
 * `v`
+* `csharp`
 <!-- * `secret` -->
 
 ---
@@ -192,3 +193,11 @@ object Main extends App {
   println("Hello")
 }
 ```
+
+---
+
+### C#
+
+```csharp
+Console.WriteLine("Hello, world!");
+```

internal/code/languages.go

@@ -36,6 +36,7 @@ const (
 	V          = "v"
 	Scala      = "scala"
 	Haskell    = "haskell"
+  CSharp     = "csharp"
 )
 
 // Languages is a map of supported languages with their extensions and commands
@@ -129,4 +130,8 @@ var Languages = map[string]Language{
 		Extension: "hs",
 		Commands: cmds{{"runghc", "<file>"}},
 	},
+  CSharp: {
+    Extension: "csx",
+    Commands: cmds{{"dotnet", "script", "<file>"}},
+  },
 }