Update windows guide (#239)

Author: cw789

README.md

@@ -189,11 +189,13 @@ behind this is that maintaining each sqlite's connection command pool is
 complicated and error prone.
 
 
-# Compiling NIF for Windows
+## Compiling NIF for Windows
+
 When compiling on Windows, you will need the [Build Tools](https://visualstudio.microsoft.com/downloads/#build-tools-for-visual-studio-2022) or equivalent toolchain. Please make sure you have the correct environment variables, including path to compiler and linker and architecture that matches `erl.exe` (likely x64).
 
 You may also need to invoke `vcvarsall.bat amd64` _before_ running `mix`.
 
+A guide is available at [guides/windows.md](./guides/windows.md)
 
 ## Contributing
 

guides/windows.md

@@ -3,7 +3,8 @@
 > Exqlite uses an [Erlang NIF](https://erlang.org/doc/tutorial/nif.html) under the hood.  
 > Means calling a native implementation in C.
 
-For Windows users this means compiling Exqlite does not magically just work.  
+For Windows users this means compiling Exqlite does not magically just work,  
+in case it's not able to use the precompiled versions of SQLite (using advanced configuration - compile flags).  
 Under the hood mix will try to compile the library with NMAKE on Windows.  
 For this, NMAKE and C++ build tools needs to be available.