Libxml2 set of examples

The examples are stored per section depending on the main focus of the example: xmlWriter : testWriter.c: use various APIs for the xmlWriterInputOutput : io1.c: Example of custom Input/Outputio2.c: Output to char bufferTree : tree1.c: Navigates a tree to print element namestree2.c: Creates a treeXPath : xpath1.c: Evaluate XPath expression and prints result node set.xpath2.c: Load a document, locat