Need a "README" file in ./project_repos

[jmueducn]

OR it would raise an error like this
"Couldn't find project repositories! Did you (re)run 'defects4j/init.sh'?

Compilation failed in require at /home/changpy/data2/datasets/GrowingBugRepository/framework/bin/defects4j line 33.
BEGIN failed--compilation aborted at /home/changpy/data2/datasets/GrowingBugRepository/framework/bin/defects4j line 33."
it is in the latest version