Add foreign language references pointing back to the main vcpkg repo.

README.md

@@ -1,5 +1,10 @@
 # Vcpkg: Overview
 
+[中文总览](https://github.com/microsoft/vcpkg/blob/master/README_zh_CN.md)
+[Español](https://github.com/microsoft/vcpkg/blob/master/README_es.md)
+[한국어](https://github.com/microsoft/vcpkg/blob/master/README_ko_KR.md)
+[Français](https://github.com/microsoft/vcpkg/blob/master/README_fr.md)
+
 Vcpkg helps you manage C and C++ libraries on Windows, Linux and MacOS.
 This tool and ecosystem are constantly evolving, and we always appreciate contributions!