branch add and commit

Change-Id: I8c15d67d33f9d926f0d9e9256a0ac6f5005f0c87
branch1 modify doc1

Change-Id: Iffb74e8620f5f5544efc4618dad72e37b58b4cd8
branch1 modify doc1 again

Change-Id: I45a7b18f724991f3e37e5606a243c75377018f4b
master modify readme again

Change-Id: I08a0e38963b7c299f5ba70d8d8f00eb701da7cdf
merge ...

h 'branch1'

# Please enter a commit message to explain why this merge is necessary,
# especially if it merges an updated upstream into a topic branch.
#
# Lines starting with '#' will be ignored, and an empty message aborts
# the commit.