Update README.md

Author: tintinweb

README.md

@@ -7,7 +7,7 @@ A Solidity parser for Python built on top of a robust ANTLR4 grammar
 
 ```
 #> pip3 install solidity_parser
-#> python3 -m solidity_parser <path_to_contract.sol>   # prettyprints tree
+#> python3 -m solidity_parser <parse|outline> <path_to_contract.sol>   # print parse tree or sourceUnit outline
 ```
 
 ## HowTo
@@ -20,7 +20,9 @@ import pprint
 from solidity_parser import parser
 
 sourceUnit = parser.parse_file(sys.argv[1])
-pprint.pprint(sourceUnit)
+pprint.pprint(sourceUnit)  
+# see output below
+
 ```
 
 output:
@@ -51,7 +53,21 @@ output:
 
 Parse-tree nodes can be accessed both like dictionaries or via object attributes. Nodes always carry a `type` field to hint the type of AST node. The start node is always of type `sourceUnit`.
 
+## Accessing AST items in an Object Oriented fashion
+
+```python
+# ... continuing from previous snippet
 
+# subparse into objects for nicer interfaces:
+# create a nested object structure from AST
+sourceUnitObject = parser.objectify(sourceUnit)
+
+# access imports, contracts, functions, ...  (see outline example in __main__.py)
+sourceUnitObject.imports  # []
+sourceUnitObject.pragmas  # []
+sourceUnitObject.contracts.keys()  # get all contract names
+sourceUnitObject.contracts["contractName"].functions.keys()  # get all functions in contract: "contractName"
+```
 
 
 ## Generate the parser