Name wrangling c++ caveat in Readme (#511)

* Name wrangling c++ caveat in Readme Try to add a small help for people not super familiar in C++ and name wrangling. * Update README.md * Update README.md
rust-lang · Jun 8, 2020 · 7859697 · 7859697
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@@ -150,6 +150,7 @@ fn main() {
 When using C++ library compilation switch, the `CXX` and `CXXFLAGS` env
 variables are used instead of `CC` and `CFLAGS` and the C++ standard library is
 linked to the crate target.
+Remember that C++ does name mangling so `extern "C"` might be required to enable rust linker to find your functions.
 
 ## CUDA C++ support