[docs] Document lld's usage of C++11 features.

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+C++11
+=====
+
+lld is developed in a limited subset of C++11. Supported compilers are:
+
+* Clang 3.1+
+* g++ 4.6+
+* MSVC 2012+
+
+Allowed Features
+----------------
+
+Allowed features are based on what these compilers support. Features that are ok
+to ommit (such as final or = delete) may be conditionally used via macros.
+
+* All of the C++11 standard library, including threading and atomics
+* auto
+* constexpr via LLVM_CONSTEXPR
+* decltype
+* deleted functions via LLVM_DELETED_FUNCTION
+* Forward enum declarations
+* Lambdas
+* Local and unnamed types as template args
+* Trailing return type 
+* nullptr
+* >> instead of > >
+* R-Value references excluding R-Value references for this
+* static_assert
+* Strongly typed enums
+* Range based for loop
+* final via LLVM_FINAL
+
+Note that some of these features may not be fullly or correctly implemented in
+all compilers. Issues using these features should be added here as they are
+encountered.