add placeholder attribute
add placeholder attribute

j796160836/webmaker-android,k88hudson/webmaker-android,bolaram/webmaker-android,alicoding/webmaker-android,codex8/webmaker-app,gvn/webmaker-android,bolaram/webmaker-android,gvn/webmaker-android,k88hudson/webmaker-android,mozilla/webmaker-android,alicoding/webmaker-android,adamlofting/webmaker-android,alanmoo/webmaker-android,rodmoreno/webmaker-android,mozilla/webmaker-android,thejdeep/webmaker-app,codex8/webmaker-app,toolness/webmaker-android,j796160836/webmaker-android,secretrobotron/webmaker-android,thejdeep/webmaker-app,vazquez/webmaker-android,vazquez/webmaker-android,secretrobotron/webmaker-android,cadecairos/webmaker-android,rodmoreno/webmaker-android,alanmoo/webmaker-android