Revert "Revert "add doc""

This reverts commit fab546daef4afbb160242dbc5dbe23a342683105.
Revert "Create gh-pages branch via GitHub"

This reverts commit 4efcddbf1953d233f22f31cf43a2bf9bd3f16ce8.
Revert "Revert "Create gh-pages branch via GitHub""

This reverts commit a159fe7097b648d0e20b627ee21bad0bf232f65d.
Revert "Revert "Revert "add doc"""

This reverts commit 45db9ff403c7022b0050e665cf6438b56a9f9af4.
Revert "Revert "add doc""

This reverts commit fab546daef4afbb160242dbc5dbe23a342683105.
Revert "Create gh-pages branch via GitHub"

This reverts commit 4efcddbf1953d233f22f31cf43a2bf9bd3f16ce8.