Mention Wiki in README.

README.md

@@ -25,7 +25,7 @@ However, most missing features are expected to be "trivial" improvements at this
 
 SPIRV-Cross has been tested on Linux, OSX and Windows.
 
-The make and CMake build flavors offer the option to treat exceptions as assertions. To disable exceptions for make just append SPIRV_CROSS_EXCEPTIONS_TO_ASSERTIONS=1 to the command line. For CMake append -DSPIRV_CROSS_EXCEPTIONS_TO_ASSERTIONS=ON. By default exceptions are enabled.
+The make and CMake build flavors offer the option to treat exceptions as assertions. To disable exceptions for make just append `SPIRV_CROSS_EXCEPTIONS_TO_ASSERTIONS=1` to the command line. For CMake append `-DSPIRV_CROSS_EXCEPTIONS_TO_ASSERTIONS=ON`. By default exceptions are enabled.
 
 ### Linux and macOS
 
@@ -39,6 +39,8 @@ MinGW-w64 based compilation works with `make`, and an MSVC 2013 solution is also
 
 ### Using the C++ API
 
+For more in-depth documentation than what's provided in this README, please have a look at the [Wiki](https://github.com/KhronosGroup/SPIRV-Cross/wiki).
+
 To perform reflection and convert to other shader languages you can use the SPIRV-Cross API.
 For example: