Sum column values on dataframe on the bottom of columns [duplicate]

Question

I have a dataframe with different columns with different values, I would calculate the sum of the values for each column and put the result on the bottom of each column

So i have a dataframe like this:

TEAM	A	B	C
RED	4	12	3
RED	2	1	1
BLUE	3	1	2
BLUE	2	5	2
YELLOW	1	2	5
YELLOW	1	2	5

And I want this as result:

TEAM	A	B	C
RED	4	12	3
RED	2	1	1
SUM	6	13	4
BLUE	3	1	2
BLUE	2	5	2
SUM	5	6	6
YELLOW	1	2	5
YELLOW	1	2	5
SUM	2	4	10

IDK how to do that

Thank you