update .gitignore

create .gitignore

update JAVA_code.md

update JAVA_code.md

update JAVA_code.md

update JAVA_code.md

update JAVA_code.md

update JAVA_code.md

update JAVA_code.md

update JAVA_code.md

update JAVA_code.md

update README.md

update README.md

update README.md

update material-login.js

create material-login.js

update material-login.html

create material-login.html

update material-ligon.css