Add ignore file.

Add ignore file to description that don't need to sync files. The
file’s changes won’t commit to repository that in ignore list.
Merge branch 'sunhb'
Update README.

modify code to start.
Merge branch 'sunhb'
修改

修改
gitignore

Add ignore files.
Merge branch 'sunhb'
Modified MainActivity

Signed-off-by: sunhb <sunhb.cnc@gmail.com>
Merge branch 'sunhb'
Merge branch 'master' of https://github.com/sunhb/HBTraining

Conflicts:
	SlowWorking/src/com/hb/slowworking/MainActivity.java