docs: Instructions to cross compile for windows (#2911)

Author: drstrangelooker

.gitignore

@@ -24,4 +24,5 @@ __pycache__/
 
 # executable
 genai-toolbox
-toolbox
+toolbox
+toolbox.exe

DEVELOPER.md

@@ -44,6 +44,42 @@ Before you begin, ensure you have the following:
     curl http://127.0.0.1:5000
     ```
 
+#### Cross Compiling For Windows
+
+Most developers work in a Unix or Unix-like environment.
+
+Compiling for Windows requires the download of zig to provide a C and C++
+compiler. These instructions are for cross compiling from Linux x86 but
+should work for macOS with small changes.
+
+1. Download zig for your platform.
+    ```bash
+    cd $HOME
+    curl -fL "https://ziglang.org/download/0.15.2/zig-x86_64-linux-0.15.2.tar.xz" -o zig.tar.xz
+    tar xf zig.tar.xz
+    ```
+    This will create the directory $HOME/zig-x86_64-linux-0.15.2. You only need to do this once.
+
+    If you are on macOS curl from https://ziglang.org/download/0.15.2/zig-x86_64-macos-0.15.2.tar.xz
+    or https://ziglang.org/download/0.15.2/zig-aarch64-macos-0.15.2.tar.xz.
+
+2. Change to your MCP Toolbox directory and run the following:
+    ```bash
+    cd $HOME/genai-toolbox
+    GOOS=windows \
+    GOARCH=amd64 \
+    CGO_ENABLED=1 \
+    CC="$HOME/zig-x86_64-linux-0.15.2/zig cc -target x86_64-windows-gnu"  \
+    CXX="$HOME/zig-x86_64-linux-0.15.2/zig c++ -target x86_64-windows-gnu" \
+    go build -o toolbox.exe
+    ```
+
+    If you are on macOS alter the path `zig-x86_64-linux-0.15.2` to the proper path
+    for your zig installation.
+
+Now the toolbox.exe file is ready to use. Transfer it to your windows machine and test it.
+
+
 ### Tool Naming Conventions
 
 This section details the purpose and conventions for MCP Toolbox's tools naming