refactor: restructure the project

languages/go/Makefile

@@ -0,0 +1,2 @@
+raylib_go: main.go
+	go build -o raylib_go main.go

languages/go/README.md

@@ -0,0 +1,8 @@
+# Raylib in Go
+
+## Quick start
+
+```sh
+$ make
+$ ./raylib_go
+```

languages/go/main.go

@@ -0,0 +1,66 @@
+package main
+
+/*
+#cgo CFLAGS: -I../raylib-5.5_linux_amd64/include
+#cgo LDFLAGS: -L../raylib-5.5_linux_amd64/lib -l:libraylib.a -lm
+#include <raylib.h>
+*/
+import "C"
+import "time"
+
+const (
+	windowWidth  = 800
+	windowHeight = 600
+	logoHeight   = 64
+	logoSpeed    = 300.0
+)
+
+func main() {
+	C.InitWindow(windowWidth, windowHeight, C.CString("Raylib in Go"))
+	C.SetTargetFPS(60)
+	C.SetRandomSeed(C.uint(time.Now().Unix()))
+
+	logoImage := C.LoadImage(C.CString("./go_logo.png"))
+	C.ImageResize(&logoImage, logoImage.width*logoHeight/logoImage.height, logoHeight)
+	logoTexture := C.LoadTextureFromImage(logoImage)
+	C.UnloadImage(logoImage)
+
+	x := float32(C.GetRandomValue(0, windowWidth-C.int(logoTexture.width)))
+	y := float32(C.GetRandomValue(0, windowHeight-C.int(logoTexture.height)))
+
+	dx := float32(logoSpeed)
+	if C.GetRandomValue(0, 1) == 1 {
+		dx = -dx
+	}
+	dy := float32(logoSpeed)
+	if C.GetRandomValue(0, 1) == 1 {
+		dy = -dy
+	}
+
+	black := C.Color{0, 0, 0, 255}
+	white := C.Color{255, 255, 255, 255}
+
+	for !bool(C.WindowShouldClose()) {
+		deltaTime := float32(C.GetFrameTime())
+
+		x += dx * deltaTime
+		y += dy * deltaTime
+
+		if x < 0 || x+float32(logoTexture.width) >= windowWidth-1 {
+			dx *= -1
+			x += dx * deltaTime
+		}
+		if y < 0 || y+float32(logoTexture.height) >= windowHeight-1 {
+			dy *= -1
+			y += dy * deltaTime
+		}
+
+		C.BeginDrawing()
+		C.ClearBackground(black)
+		C.DrawTextureV(logoTexture, C.Vector2{x: C.float(x), y: C.float(y)}, white)
+		C.EndDrawing()
+	}
+
+	C.UnloadTexture(logoTexture)
+	C.CloseWindow()
+}