Added a table of contents to the README.
Added a table of contents to the README.

zillemarco/CppSharp,zillemarco/CppSharp,ddobrev/CppSharp,zillemarco/CppSharp,mono/CppSharp,mohtamohit/CppSharp,mohtamohit/CppSharp,ktopouzi/CppSharp,ktopouzi/CppSharp,mohtamohit/CppSharp,mono/CppSharp,mohtamohit/CppSharp,genuinelucifer/CppSharp,inordertotest/CppSharp,genuinelucifer/CppSharp,u255436/CppSharp,zillemarco/CppSharp,inordertotest/CppSharp,inordertotest/CppSharp,inordertotest/CppSharp,ktopouzi/CppSharp,ddobrev/CppSharp,mono/CppSharp,u255436/CppSharp,inordertotest/CppSharp,ddobrev/CppSharp,ktopouzi/CppSharp,u255436/CppSharp,mono/CppSharp,genuinelucifer/CppSharp,genuinelucifer/CppSharp,zillemarco/CppSharp,ddobrev/CppSharp,genuinelucifer/CppSharp,u255436/CppSharp,mono/CppSharp,mono/CppSharp,ddobrev/CppSharp,ktopouzi/CppSharp,u255436/CppSharp,mohtamohit/CppSharp