Added phase 2 description to readme

Author: achimr

README.md

@@ -8,10 +8,17 @@ Collecting data for machine translation training from CommonCrawl is a two-phase
 
 The first phase detects the languages of the web pages contained in the crawl and other meta-data. A database is built from this data that can be accessed via a RESTful web API.
 
-In this phase monolingual data for language model training can be generated. The data for some of the CommonCrawl crawls and some languages can be found on:
+The [metadata documentation](/metadata/metadata.md) describes phase 1 step-by-step.
+
+In this phase monolingual data for language model training can be extracted. The data for some of the CommonCrawl crawls and some languages can be found on:
 
 * http://statmt.org/ngrams/
 * http://www.statmt.org/wmt16/translation-task.html
 
 For more details on the monolingual data see [ModernMT Deliverable 2.1](http://www.modernmt.eu/deliverables/mmt-d2-1-report-on-data-repository/).
 
+## Phase 2: Extracting parallel data and optional cleaning
+ 
+In the second phase the meta-data collected in phase 1 is used to extract parallel data from CommonCrawl data based on URL pattern matching. Phase 2 is documented step-by-step in the [baseline documentation](/baseline/baseline.md)
+
+For the language pairs en↔it, en↔fr and en↔it matched URL data is available for quick data extraction in release 0.1.0 https://github.com/ModernMT/DataCollection/releases/tag/0.1.0