rename existing examples for consistent naming

examples/text/writing_anim.zig

@@ -0,0 +1,46 @@
+const rl = @import("raylib");
+const Color = rl.Color;
+
+//------------------------------------------------------------------------------------
+// Program main entry point
+//------------------------------------------------------------------------------------
+pub fn main() void {
+    // Initialization
+    //--------------------------------------------------------------------------------------
+    const screenWidth = 800;
+    const screenHeight = 450;
+
+    rl.initWindow(screenWidth, screenHeight, "raylib [text] example - text writing anim");
+    defer rl.closeWindow(); // Close window and OpenGL context
+
+    const message = "This sample illustrates a text writing\nanimation effect! Check it out! ;)";
+
+    var framesCounter: i32 = 0;
+
+    rl.setTargetFPS(60); // Set our game to run at 60 frames-per-second
+    //--------------------------------------------------------------------------------------
+
+    // Main game loop
+    while (!rl.windowShouldClose()) // Detect window close button or ESC key
+    {
+        // Update
+        //----------------------------------------------------------------------------------
+        framesCounter += if (rl.isKeyDown(.space)) 8 else 1;
+
+        if (rl.isKeyPressed(.enter)) framesCounter = 0;
+        //----------------------------------------------------------------------------------
+        // Draw
+        //----------------------------------------------------------------------------------
+        rl.beginDrawing();
+
+        rl.clearBackground(Color.white);
+
+        rl.drawText(rl.textSubtext(message, 0, @divFloor(framesCounter, 10)), 210, 160, 20, Color.maroon);
+
+        rl.drawText("PRESS [ENTER] to RESTART!", 240, 260, 20, Color.light_gray);
+        rl.drawText("HOLD [SPACE] to SPEED UP!", 239, 300, 20, Color.light_gray);
+
+        rl.endDrawing();
+        //----------------------------------------------------------------------------------
+    }
+}