chore: 初始化 mq-starter 仓库（.gitignore + README）

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

.gitignore

@@ -0,0 +1,32 @@
+# Compiled class file
+*.class
+
+# Log file
+*.log
+logs/
+
+# Package Files
+*.jar
+*.war
+*.ear
+*.tar.gz
+*.rar
+
+# Maven
+target/
+
+# IDE
+*.iml
+*.ipr
+*.iws
+.idea/
+.classpath
+.project
+.settings/
+.factorypath
+
+# virtual machine crash logs
+hs_err_pid*
+replay_pid*
+
+.DS_Store