nokogiri: add page

pages/common/nokogiri.md

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+# nokogiri
+
+> An HTML, XML, SAX and Reader parser.
+
+- Parse the contents of a url or file:
+
+`nokogiri {{url|path/to/file}}`
+
+- Parse as a specific type:
+
+`nokogiri {{url|path/to/file}} --type {{xml|html}}`
+
+- Load a specific initialisation file before parsing:
+
+`nokogiri {{url|path/to/file}} -C {{path/to/config_file}}`
+
+- Parse using a specific encoding:
+
+`nokogiri {{url|path/to/file}} --encoding {{encoding}}`
+
+- Validate using a RELAX NG file:
+
+`nokogiri {{url|path/to/file}} --rng {{url|path/to/file}}`