Create README in python folder

Author: tamshai

AnalysisFW/python/README.md

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+## Setup
+
+
+1. Download index files: 
+    
+    ```
+    wget http://opendata.cern.ch/record/21/files/CMS_Run2011A_Jet_AOD_12Oct2013-v1_20000_file_index.txt
+    wget http://opendata.cern.ch/record/1562/files/CMS_MonteCarlo2011_Summer11LegDR_QCD_Pt-80to120_TuneZ2_7TeV_pythia6_AODSIM_PU_S13_START53_LV6-v1_00000_file_index.txt 
+    ```
+    
+2. Download JSON of good runs:
+
+    ```
+    wget http://opendata.cern.ch/record/1001/files/Cert_160404-180252_7TeV_ReRecoNov08_Collisions11_JSON.txt
+    ```
+    
+3. Make link to the condition databases:
+
+    ```
+    ln -sf /cvmfs/cms-opendata-conddb.cern.ch/FT_53_LV5_AN1_RUNA FT_53_LV5_AN1 
+    ln -sf /cvmfs/cms-opendata-conddb.cern.ch/FT_53_LV5_AN1_RUNA.db FT_53_LV5_AN1_RUNA.db
+    
+    ln -sf /cvmfs/cms-opendata-conddb.cern.ch/START53_LV6A1 START53_LV6A1
+    ln -sf /cvmfs/cms-opendata-conddb.cern.ch/START53_LV6A1.db START53_LV6A1.db
+    ```
+    
+4. Finally,test the configuration files:
+
+    ```
+    cmsRun OpenDataTreeProducer_dataPAT_2011_cfg.py
+    cmsRun OpenDataTreeProducer_mcPAT_2011_cfg.py
+    ```