Explain how to use NLP

Author: gabriele-tomassetti

README.md

@@ -176,9 +176,23 @@ The **IsReadable** property will be false if no article was extracted, whatever
 
 ### Natural Language Processing Features
 
-Often the webpage containing the article will contain metadata about the language used in the article. Sometimes this is not true, so the library comes with a delegate `LanguageIdentification` that can be used to identify the language based on the text itself. The default method just returns the language in the metadata. This is the old, standard behavior.
+Often the webpage containing the article will contain metadata about the language used in the article. Sometimes this is not true, so the library comes with a delegate `LanguageIdentification` in `Article`, that can be used to identify the language based on the text itself. This delegate will be called on the `TextContent` of the `Article`. The default method just returns the language in the metadata. This is the old, standard behavior.
 
 You can use the delegate to implement your own method to identify the language. We also provide a decent implementation, that actually does something, using FastText. This implementation is distributed in a separate nuget package, `SmartReader.NaturalLanguageProcessing`.
+To use the language identification feature you will need to call the `Enable` method.
+
+```
+NLP.Enable();
+```
+
+This will change the delegate `LanguageIdentification`, so it will automatically identify the language and set the property `Language` in every `Article` object created by the library.
+
+
+To restore the default behavior, instead use `RestoreDefaults`.
+
+```
+NLP.RestoreDefaults();
+```
 
 There is also a delegate to create a summary of the article : `CreateSummary`. Also in this case the default implementation returns the summary provided by the metadata. In practice this is usually a short summary meant for social media sharing. At this moment we do not provide any better implementation.
 

docfx_project/articles/advanced.md

@@ -133,7 +133,23 @@ Article.Converter = MagicConverter;
 
 ## Natural Language Processing
 
-Often the webpage containing the article will contain metadata about the language used in the article. Sometimes this is not true, so the library comes with a delegate `LanguageIdentification` that can be used to identify the language based on the text itself. The default method just returns the language in the metadata. This is the old, standard behavior. 
+Often the webpage containing the article will contain metadata about the language used in the article. Sometimes this is not true, so the library comes with a delegate `LanguageIdentification` in `Article`, that can be used to identify the language based on the text itself. This delegate will be called on the `TextContent` of the `Article`. The default method just returns the language in the metadata. This is the old, standard behavior.
+
+You can use the delegate to implement your own method to identify the language. We also provide a decent implementation, that actually does something, using FastText. This implementation is distributed in a separate nuget package, `SmartReader.NaturalLanguageProcessing`.
+To use the language identification feature you will need to call the `Enable` method.
+
+```
+NLP.Enable();
+```
+
+This will change the delegate `LanguageIdentification`, so it will automatically identify the language and set the property `Language` in every `Article` object created by the library.
+
+
+To restore the default behavior, instead use `RestoreDefaults`.
+
+```
+NLP.RestoreDefaults();
+```
 
 The delegate accepts two arguments:
 - the first one will receive the text of the article

src/SmartReader.NaturalLanguageProcessing/README.md

@@ -4,4 +4,4 @@ This library provides a basic implementation for the natural language processing
 
 We want to provide also a basic implementation for creating a summary, but there is no timeline yet.
 
- This library is meant to be just a wrapper to hook natural language processing features into SmartReader. Implementation of the features come from other libraries.
+This library is meant to be just a wrapper to hook natural language processing features into SmartReader. Implementation of the features come from other libraries.