Add Composer autoloading functions and PHPStan for testing

vendor/nikic/php-parser/doc/README.md

@@ -0,0 +1,46 @@
+Table of Contents
+=================
+
+Guide
+-----
+
+  1. [Introduction](0_Introduction.markdown)
+  2. [Usage of basic components](2_Usage_of_basic_components.markdown)
+
+Component documentation
+-----------------------
+
+  * [Walking the AST](component/Walking_the_AST.markdown)
+    * Node visitors
+    * Modifying the AST from a visitor
+    * Short-circuiting traversals
+    * Interleaved visitors
+    * Simple node finding API
+    * Parent and sibling references
+  * [Name resolution](component/Name_resolution.markdown)
+    * Name resolver options
+    * Name resolution context
+  * [Pretty printing](component/Pretty_printing.markdown)
+    * Converting AST back to PHP code
+    * Customizing formatting
+    * Formatting-preserving code transformations
+  * [AST builders](component/AST_builders.markdown)
+    * Fluent builders for AST nodes
+  * [Lexer](component/Lexer.markdown)
+    * Lexer options
+    * Token and file positions for nodes
+    * Custom attributes
+  * [Error handling](component/Error_handling.markdown)
+    * Column information for errors
+    * Error recovery (parsing of syntactically incorrect code)
+  * [Constant expression evaluation](component/Constant_expression_evaluation.markdown)
+    * Evaluating constant/property/etc initializers
+    * Handling errors and unsupported expressions
+  * [JSON representation](component/JSON_representation.markdown)
+    * JSON encoding and decoding of ASTs
+  * [Performance](component/Performance.markdown)
+    * Disabling XDebug
+    * Reusing objects
+    * Garbage collection impact
+  * [Frequently asked questions](component/FAQ.markdown)
+    * Parent and sibling references