added merged historical and future data

visual_pbi.py

@@ -0,0 +1,7 @@
+import pandas as pd
+
+merged_df = pd.read_csv('data/afghan_wheatfcasts.csv', parse_dates = ['Date'])
+df_backtest_ = pd.read_csv('data/aghanwheat_allhistorical.csv', parse_dates=['Date'])
+# df_backtest_.rename(columns={'date':"Date"},inplace=True)
+final_maize = pd.merge(df_backtest_,merged_df,on=['Date'],how='outer')
+final_maize.to_excel('data/final_afgh_wheat.xlsx',index=False)