add README

README.md

+# git命令 ##
+>拉取远程仓库主干代码
+```sh 
+git pull origin master
+```
+>将本地已提交代码推送至远程仓库
+```sh 
+git push origin master
+```
+>忽略某文件修改不提交到远程仓库
+```sh 
+git update-index --assume-unchanged [file-path]
+eg: git update-index --assume-unchanged FMP-WEB\src\main\resources\jdbc.properties
+```
+>取消忽略某文件提交到远程仓库
+```sh 
+git update-index --no-assume-unchanged [file-path] 
+eg: git update-index --no-assume-unchanged FMP-WEB\src\main\resources\jdbc.properties
+```
+>回退版本后提交到远程仓库
+```sh 
+git push -f -u origin [branch]
+eg: git push -f -u origin master
+```
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