[#120] move dog.go from root folder

pkg/parser/doc.go

@@ -0,0 +1,50 @@
+/*
+
+A Parser for PHP written in Go
+
+Package usage example:
+
+	package main
+
+	import (
+		"log"
+		"os"
+
+		"github.com/z7zmey/php-parser/pkg/cfg"
+		"github.com/z7zmey/php-parser/pkg/errors"
+		"github.com/z7zmey/php-parser/pkg/parser"
+		"github.com/z7zmey/php-parser/pkg/version"
+		"github.com/z7zmey/php-parser/pkg/visitor/dumper"
+	)
+
+	func main() {
+		src := []byte(`<? echo "Hello world";`)
+
+		// Error handler
+
+		var parserErrors []*errors.Error
+		errorHandler := func(e *errors.Error) {
+			parserErrors = append(parserErrors, e)
+		}
+
+		// Parse
+	
+		rootNode, err := parser.Parse(src, cfg.Config{
+			Version:          &version.Version{Major: 5, Minor: 6},
+			ErrorHandlerFunc: errorHandler,
+		})
+
+		if err != nil {
+			log.Fatal("Error:" + err.Error())
+		}
+
+		// Dump
+
+		goDumper := dumper.NewDumper(os.Stdout).
+			WithTokens().
+			WithPositions()
+
+		rootNode.Accept(goDumper)
+	}
+*/
+package parser