Git不添加IDE配置文件，过滤提交

如果./idea已经在版本中，则.gitignore配置会失效，用git rm –cached -r .idea/可移除(在代码库中去除，又能保留本地的.idea文件夹)

.gitignore文件内容

.HELP.md

target/

!.mvn/wrapper/maven-wrapper.jar

!**/src/main/**

!**/src/test/**

### STS ###

.apt_generated

.classpath

.factorypath

.project

.settings

.springBeans

.sts4-cache

### IntelliJ IDEA ###

*.iws

*.iml

*.ipr

.git

.svn

#.gitignore

### NetBeans ###

/nbproject/private/

/nbbuild/

/dist/

/nbdist/

/.nb-gradle/

build/

### VS Code ###

.vscode/

/.idea/