add chancelog file
Revert "add chancelog file"

This reverts commit a7719e95ea4eedf8f6ec0aa59ca13570f8677e6a.
improvement of read me
Revert "improvement of read me"

This reverts commit a97a01c26b1df6c4085e7fef1cc042f710e1fb8a.
improvement of read me and add changeLog