Revert "remove tracked .class files"

This reverts commit c436a0e4ea.

.idea/.gitignore

@@ -0,0 +1,26 @@
+# 默认忽略的文件
+/shelf/
+/workspace.xml
+# 基于编辑器的 HTTP 客户端请求
+/httpRequests/
+# Datasource local storage ignored files
+/dataSources/
+/dataSources.local.xml
+# Java class files
+*.class
+
+# Maven
+/target/
+
+# Gradle
+/build/
+
+# Logs
+*.log
+
+# IDE config
+.idea/
+*.iml
+*.iws
+.vscode/
+.DS_Store