Add vendor

Specifically because I want to modify a dependency

vendor/github.com/charmbracelet/x/windows/LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2023 Charmbracelet, Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

vendor/github.com/charmbracelet/x/windows/doc.go

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+package windows
+
+//go generate go run golang.org/x/sys/windows/mkwinsyscall -output zsyscall_windows.go syscall_windows.go

vendor/github.com/charmbracelet/x/windows/syscall_windows.go

@@ -0,0 +1,10 @@
+package windows
+
+import "golang.org/x/sys/windows"
+
+var NewLazySystemDLL = windows.NewLazySystemDLL
+
+type Handle = windows.Handle
+
+//sys GetKeyboardLayout(threadId uint32) (hkl Handle, err error) = user32.GetKeyboardLayout
+//sys ToUnicodeEx(vkey uint32, scancode uint32, keystate *byte, pwszBuff *uint16, cchBuff int32, flags uint32, hkl Handle) (ret int32, err error) = user32.ToUnicodeEx

vendor/github.com/charmbracelet/x/windows/zsyscall_windows.go

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+// Code generated by 'go generate'; DO NOT EDIT.
+
+package windows
+
+import (
+	"syscall"
+	"unsafe"
+)
+
+var _ unsafe.Pointer
+
+// Do the interface allocations only once for common
+// Errno values.
+const (
+	errnoERROR_IO_PENDING = 997
+)
+
+var (
+	errERROR_IO_PENDING error = syscall.Errno(errnoERROR_IO_PENDING)
+	errERROR_EINVAL     error = syscall.EINVAL
+)
+
+// errnoErr returns common boxed Errno values, to prevent
+// allocations at runtime.
+func errnoErr(e syscall.Errno) error {
+	switch e {
+	case 0:
+		return errERROR_EINVAL
+	case errnoERROR_IO_PENDING:
+		return errERROR_IO_PENDING
+	}
+	// TODO: add more here, after collecting data on the common
+	// error values see on Windows. (perhaps when running
+	// all.bat?)
+	return e
+}
+
+var (
+	moduser32 = NewLazySystemDLL("user32.dll")
+
+	procGetKeyboardLayout = moduser32.NewProc("GetKeyboardLayout")
+	procToUnicodeEx       = moduser32.NewProc("ToUnicodeEx")
+)
+
+func GetKeyboardLayout(threadId uint32) (hkl Handle, err error) {
+	r0, _, e1 := syscall.Syscall(procGetKeyboardLayout.Addr(), 1, uintptr(threadId), 0, 0)
+	hkl = Handle(r0)
+	if hkl == 0 {
+		err = errnoErr(e1)
+	}
+	return
+}
+
+func ToUnicodeEx(vkey uint32, scancode uint32, keystate *byte, pwszBuff *uint16, cchBuff int32, flags uint32, hkl Handle) (ret int32, err error) {
+	r0, _, e1 := syscall.Syscall9(procToUnicodeEx.Addr(), 7, uintptr(vkey), uintptr(scancode), uintptr(unsafe.Pointer(keystate)), uintptr(unsafe.Pointer(pwszBuff)), uintptr(cchBuff), uintptr(flags), uintptr(hkl), 0, 0)
+	ret = int32(r0)
+	if ret == 0 {
+		err = errnoErr(e1)
+	}
+	return
+}