input dataframe

```
row     name    Min
11      AA      0.3
11      AA      0.2
11      BB      0.3
11      CC      0.2
12      AS      0.3
12      BE      0.3
12      BE      0.4

```

need to generate new column '`count`' which holds info on number of times each row-name combo occurs.

**Expected Output**

```
row     name    Min     Count
11      AA      0.3         2
11      AA      0.2         2
11      BB      0.3         1
11      CC      0.2         1
12      AS      0.3         1
12      BE      0.3         2
12      BE      0.4         2

```