init: 后台代码初始化

.gitignore

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+# kdiff3 ignore
+*.orig
+
+# maven ignore
+target/
+
+# eclipse ignore
+.settings/
+.project
+.classpath
+
+# idea ignore
+.idea/
+*.ipr
+*.iml
+*.iws
+
+# temp ignore
+*.log
+*.cache
+*.diff
+*.patch
+*.tmp
+tmp/
+
+# system ignore
+.DS_Store
+Thumbs.db
+
+# package ignore (optional)
+# *.jar
+
+#rebel
+rebel.xml