test(csharp): add CsharpFileContextBuilder and CsharpClassContextBuilderTest

This commit adds the CsharpFileContextBuilder class, which implements the FileContextBuilder interface and provides the getFileContext method for C# files. It also includes the CsharpClassContextBuilderTest class, which contains a test case for the getFileContext method.

Author: phodal

csharp/src/main/kotlin/cc/unitmesh/csharp/context/CsharpFileContextBuilder.kt

@@ -0,0 +1,15 @@
+package cc.unitmesh.csharp.context
+
+import cc.unitmesh.devti.context.FileContext
+import cc.unitmesh.devti.context.builder.FileContextBuilder
+import com.intellij.psi.PsiFile
+import com.jetbrains.rider.ideaInterop.fileTypes.csharp.psi.CSharpFile
+
+class CsharpFileContextBuilder: FileContextBuilder {
+    override fun getFileContext(psiFile: PsiFile): FileContext? {
+        if(psiFile !is CSharpFile) return null
+
+
+        return null
+    }
+}

csharp/src/test/kotlin/cc/unitmesh/csharp/context/CsharpClassContextBuilderTest.kt

@@ -0,0 +1,32 @@
+package cc.unitmesh.csharp.context;
+
+import com.intellij.psi.PsiFileFactory
+import com.intellij.testFramework.LightPlatform4TestCase
+import com.jetbrains.rider.ideaInterop.fileTypes.csharp.CSharpFileType
+import org.junit.Test
+
+class CsharpClassContextBuilderTest : LightPlatform4TestCase() {
+
+    @Test
+    fun testShouldReturnNullWhenPsiElementIsNotCSharpBlock() {
+        val code = """
+            // Hello World! program
+            namespace HelloWorld
+            {
+                class Hello {         
+                    static void Main(string[] args)
+                    {
+                        System.Console.WriteLine("Hello World!");
+                    }
+                }
+            }
+            """.trimIndent()
+
+//        val psiElement =
+//            PsiFileFactory.getInstance(project)
+//                .createFileFromText("HelloWorld.cs", CSharpFileType, code)
+
+//        val builder: ClassContextBuilder = CsharpClassContextBuilder()
+//        builder.getClassContext(psiElement, false)
+    }
+}