Add source example files

source/pandas/01-pandas-manual/01-series-demo.py

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+"""Define simple Series objects by hand."""
+import pandas as pd
+
+if __name__ == '__main__':
+    # Creating a series with coherent value type
+    s1 = pd.Series([1, 3, 7, 9, 13, 15, 19, 21])
+
+    # Get the length of the series
+    print(f"Size of the series: {len(s1)}")
+    # Display the contents of s1
+    print(s1)