Adding monolingual data links

Author: achimr

monolingual/README.md

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+For monolingual [Common Crawl](http://commoncrawl.org) data and code to process it please refer to these resources:
+* [University of Edinburgh N-gram site](http://statmt.org/ngrams)
+* Code to process corpora: https://github.com/kpu/preprocess
+* Code to produce raw monolingual files from CommonCrawl: https://github.com/treigerm/CommonCrawlProcessing
+* Alternative monolingual data extraction under development in ParaCrawl project: https://github.com/paracrawl/extractor