Added license information to README.md
Added license information to README.md

Added license information to README.md
behrtam/xpython,jmluy/xpython,behrtam/xpython,exercism/xpython,smalley/python,N-Parsons/exercism-python,pheanex/xpython,smalley/python,pheanex/xpython,exercism/python,exercism/xpython,exercism/python,jmluy/xpython,N-Parsons/exercism-python