Update README.md

Add description and dependancy information.

README.md

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 # Text mining scholarly API
 
+The project helps download the full text of scholarly publications for a given list of DOIs using the Crossref API. It then stores the full text files in a MongoDB database. 
+
+The project runs using Python3 code and requires the following Python libraries:
+1. habanero
+2. pymongo
+3. bson
+4. requests
+5. lxml
+6. io
+
+For more detailed descriptions for running, please refer to the `requirements.txt` file. 
+
+
 `dois.txt` : Text file that contains the 286 DOIs
 
 `output.txt` : Text file that produces after running through the API pipeline