Add Windows support (x86_64 and ARM64)

- Add Windows binaries to download table and PowerShell install instructions
- Update install.sh to handle Windows (Git Bash/MSYS2/WSL) with .zip extraction
- Add platform-specific PATH guidance

Author: dnnspaul

README.md

@@ -24,6 +24,24 @@ Install to a custom directory:
 curl -fsSL https://raw.githubusercontent.com/blaumedia/paperhero-cli/master/install.sh | sh -s -- --dir ~/.local/bin
 ```
 
+### Windows (PowerShell)
+
+```powershell
+# Download latest release
+$arch = if ($env:PROCESSOR_ARCHITECTURE -eq "ARM64") { "arm64" } else { "amd64" }
+$release = Invoke-RestMethod "https://api.github.com/repos/blaumedia/paperhero-cli/releases/latest"
+$asset = $release.assets | Where-Object { $_.name -eq "paperhero_windows_${arch}.zip" }
+Invoke-WebRequest $asset.browser_download_url -OutFile paperhero.zip
+Expand-Archive paperhero.zip -DestinationPath "$env:LOCALAPPDATA\paperhero" -Force
+Remove-Item paperhero.zip
+
+# Add to PATH (current session)
+$env:PATH += ";$env:LOCALAPPDATA\paperhero"
+
+# Add to PATH (permanent, user-level)
+[Environment]::SetEnvironmentVariable("PATH", $env:PATH + ";$env:LOCALAPPDATA\paperhero", "User")
+```
+
 ### Manual download
 
 Download the binary for your platform from the [Releases](https://github.com/blaumedia/paperhero-cli/releases) page.
@@ -34,14 +52,24 @@ Download the binary for your platform from the [Releases](https://github.com/bla
 | Linux    | ARM64       | `paperhero_linux_arm64.tar.gz` |
 | macOS    | Intel       | `paperhero_darwin_amd64.tar.gz` |
 | macOS    | Apple Silicon | `paperhero_darwin_arm64.tar.gz` |
+| Windows  | x86_64      | `paperhero_windows_amd64.zip` |
+| Windows  | ARM64       | `paperhero_windows_arm64.zip` |
 
-Extract and move to your PATH:
+**Linux / macOS:**
 
 ```bash
 tar -xzf paperhero_*.tar.gz
 sudo mv paperhero /usr/local/bin/
 ```
 
+**Windows (PowerShell):**
+
+```powershell
+Expand-Archive paperhero_windows_amd64.zip -DestinationPath .
+Move-Item paperhero.exe C:\Windows\System32\
+# Or add the directory to your PATH instead
+```
+
 ### Verify installation
 
 ```bash

install.sh

@@ -43,9 +43,10 @@ detect_platform() {
     ARCH=$(uname -m)
 
     case "$OS" in
-        linux)   OS="linux" ;;
-        darwin)  OS="darwin" ;;
-        *)       error "Unsupported operating system: $OS" ;;
+        linux)       OS="linux" ;;
+        darwin)      OS="darwin" ;;
+        mingw*|msys*|cygwin*) OS="windows" ;;
+        *)           error "Unsupported operating system: $OS. On Windows, use PowerShell or download manually from GitHub releases." ;;
     esac
 
     case "$ARCH" in
@@ -106,8 +107,12 @@ main() {
     info "Installing PaperHero CLI ${VERSION}"
 
     # Construct download URL
-    # Binary naming: paperhero_<os>_<arch> (e.g. paperhero_linux_amd64)
-    ARCHIVE_NAME="${BINARY_NAME}_${OS}_${ARCH}.tar.gz"
+    # Binary naming: paperhero_<os>_<arch>.tar.gz (Linux/macOS) or .zip (Windows)
+    if [ "$OS" = "windows" ]; then
+        ARCHIVE_NAME="${BINARY_NAME}_${OS}_${ARCH}.zip"
+    else
+        ARCHIVE_NAME="${BINARY_NAME}_${OS}_${ARCH}.tar.gz"
+    fi
     DOWNLOAD_URL="https://github.com/${REPO}/releases/download/${VERSION}/${ARCHIVE_NAME}"
     CHECKSUM_URL="https://github.com/${REPO}/releases/download/${VERSION}/checksums.txt"
 
@@ -147,21 +152,27 @@ main() {
 
     # Extract
     info "Extracting..."
-    tar -xzf "${TMP_DIR}/${ARCHIVE_NAME}" -C "$TMP_DIR"
+    if [ "$OS" = "windows" ]; then
+        unzip -q "${TMP_DIR}/${ARCHIVE_NAME}" -d "$TMP_DIR" || error "Extraction failed. Is 'unzip' installed?"
+        BINARY_FILE="${BINARY_NAME}.exe"
+    else
+        tar -xzf "${TMP_DIR}/${ARCHIVE_NAME}" -C "$TMP_DIR"
+        BINARY_FILE="${BINARY_NAME}"
+    fi
 
     # Install
     if [ -w "$INSTALL_DIR" ] || [ "$NO_SUDO" -eq 1 ]; then
         mkdir -p "$INSTALL_DIR"
-        mv "${TMP_DIR}/${BINARY_NAME}" "${INSTALL_DIR}/${BINARY_NAME}"
-        chmod +x "${INSTALL_DIR}/${BINARY_NAME}"
+        mv "${TMP_DIR}/${BINARY_FILE}" "${INSTALL_DIR}/${BINARY_FILE}"
+        chmod +x "${INSTALL_DIR}/${BINARY_FILE}" 2>/dev/null || true
     else
         info "Requesting sudo to install to ${INSTALL_DIR}..."
         sudo mkdir -p "$INSTALL_DIR"
-        sudo mv "${TMP_DIR}/${BINARY_NAME}" "${INSTALL_DIR}/${BINARY_NAME}"
-        sudo chmod +x "${INSTALL_DIR}/${BINARY_NAME}"
+        sudo mv "${TMP_DIR}/${BINARY_FILE}" "${INSTALL_DIR}/${BINARY_FILE}"
+        sudo chmod +x "${INSTALL_DIR}/${BINARY_FILE}" 2>/dev/null || true
     fi
 
-    info "PaperHero CLI ${VERSION} installed to ${INSTALL_DIR}/${BINARY_NAME}"
+    info "PaperHero CLI ${VERSION} installed to ${INSTALL_DIR}/${BINARY_FILE}"
     printf "\n"
     printf "${BOLD}Get started:${NC}\n"
     printf "  paperhero login --api-url <url> --customer-id <id> --email <email> --password <pass>\n"
@@ -171,7 +182,11 @@ main() {
     # Verify the binary is on PATH
     if ! command -v "$BINARY_NAME" >/dev/null 2>&1; then
         warn "${INSTALL_DIR} is not in your PATH. Add it with:"
-        warn "  export PATH=\"${INSTALL_DIR}:\$PATH\""
+        if [ "$OS" = "windows" ]; then
+            warn "  Add ${INSTALL_DIR} to your system PATH via System Properties > Environment Variables"
+        else
+            warn "  export PATH=\"${INSTALL_DIR}:\$PATH\""
+        fi
     fi
 }