fix a doc issue to add `/utf-8` on MSVC

README.md

@@ -56,6 +56,7 @@ To compile it with your project, these flags must be set:
 
 + `--std=c++17` flag must be set
 + Exception must be enabled
++ For MSVC, `/utf-8` flag must be set
 
 For development build on Linux, use this snippet.
 ```bash

docs/quick-start/installation.md

@@ -43,6 +43,7 @@ To compile it with your project, these flags must be set:
 
 + `--std=c++17` flag must be set
 + Exception must be enabled
++ For MSVC, `/utf-8` flag must be set
 
 For emscripten, you must enable exceptions to make pocketpy work properly.
 See https://emscripten.org/docs/porting/exceptions.html.