add README

README

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+Dependencies: curlpp, rapidjson
+
+To build please do:
+
+mkdir build
+cd build
+cmake ..
+make
+
+How to use?
+-----------
+1. First run the fetch_all binary with your api key as argument.
+  It will fetch the json data into your local folder.
+
+2. Run parser with argument "--download" (this will
+  download all the images).
+
+3. Run the "genexifall" script- Supply the folder name
+  containing the dwnloaded images as parameter.
+
+4. Run parser again without any arguments.
+   You should get the out.csv file generated at this step
+  (This is the file that you can use to import the data on OpenRefine).
+