Add missing copyright header

kotlin-analysis-api/src/main/kotlin/com/google/devtools/ksp/common/impl/KSPCompilationError.kt

diff --git a/kotlin-analysis-api/src/main/kotlin/com/google/devtools/ksp/common/impl/KSPCompilationError.kt b/kotlin-analysis-api/src/main/kotlin/com/google/devtools/ksp/common/impl/KSPCompilationError.kt
index 4f27e71..2f0d87d 100644
--- a/kotlin-analysis-api/src/main/kotlin/com/google/devtools/ksp/common/impl/KSPCompilationError.kt
+++ b/kotlin-analysis-api/src/main/kotlin/com/google/devtools/ksp/common/impl/KSPCompilationError.kt
@@ -1,3 +1,20 @@
+/*
+ * Copyright 2024 Google LLC
+ * Copyright 2010-2024 JetBrains s.r.o. and Kotlin Programming Language contributors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
 package com.google.devtools.ksp.common.impl
 
 import com.intellij.psi.PsiFile