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Update README.md

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Signed-off-by: David Rotermund <54365609+davrot@users.noreply.github.com>
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@ -730,6 +730,59 @@ E 0.546581
Name: Beta, dtype: float64
```
### Naming the series beforehand
```python
import pandas as pd
import numpy as np
index = pd.Series(["A", "B", "C", "D", "E"])
rng = np.random.default_rng()
np_data_1 = rng.random((5))
data_1 = pd.Series(np_data_1, index=index)
np_data_2 = rng.random((5))
data_2 = pd.Series(np_data_2, index=index)
data_1.name = "Alpha"
data_2.name = "Beta"
data_3 = pd.concat([data_1, data_2], axis=1)
print(data_3)
print()
print(data_3.Alpha)
print()
print(data_3["Alpha"])
```
Output
```python
Alpha Beta
A 0.364595 0.975976
B 0.087011 0.019219
C 0.673742 0.668080
D 0.416863 0.665931
E 0.243193 0.221337
A 0.364595
B 0.087011
C 0.673742
D 0.416863
E 0.243193
Name: Alpha, dtype: float64
A 0.364595
B 0.087011
C 0.673742
D 0.416863
E 0.243193
Name: Alpha, dtype: float64
```
## Saving (pandas.DataFrame.to_pickle) / loading (pandas.read_pickle) data ‘natively’​
Save: