using branch dev add new file test.txt
text.txt add 222
master test.txt add 222
Merge branch 'feature'
add test.txt 333
master add 111
master add new file
add filetest
dev add 222
Merge branch 'dev'
dev second add file
Merge branch 'dev'
add 555
add new dev
Merge branch 'dev'
add text1.txt333