create directory
URL set
add .gitignore
simulartor test view
random number generation
rm *.pyc
make a better .gitignore
make a better .gitignore v2
README.md update
backend multinomial distribution finished
Merge branch 'backend'
Update README.md
Update README.md
Update README.md
Update README.md
Merge branch 'master' into frontend

merge the backend to my branch
prepared the canvas stage

the stage is ready.  will finish animation soon