Update README.md

Update README.md

Rename submit.m to 0_56_submit.m

Rename sigmoid.m to 5_sigmoid.m

Rename predictOneVsAll.m to 5_predictOneVsAll.m

Rename predict.m to 6_predict.m

Update 5_oneVsAll.m

Rename oneVsAll.m to 5_oneVsAll.m

Delete ex3weights.mat

Rename lrCostFunction.m to 5_lrCostFunction.m

Rename fmincg.m to 5_fmincg.m

Add files via upload

Delete ex3data1.mat

Rename ex3_nn.m to 6_ex3_nn.m

Rename ex3.m to 5_ex3.m